[chore] [exporter/splunkhec] fix flaky test expecting all requests to be gzipped.

[atoulme]

Description:
Fix flaky test expecting all requests to be gzipped. The last request might not be zipped.

Link to tracking Issue:
#17177

Testing:
Ran the test locally and didn't see a flaky behavior anymore.

Documentation:
N/A

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test duration(40 minutes 19 seconds) has decreased 19 minutes 38 seconds compared to main branch avg(59 minutes 57 seconds).

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✅  check-links workflow has finished in 41 seconds (2 minutes 50 seconds less than main branch avg.) and finished at 21st Dec, 2022.

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Job	Failed Steps	Tests
changed files	-     🔗	N/A	See Details
check-links	-     🔗	N/A	See Details

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✅  tracegen workflow has finished in 1 minute 8 seconds (2 minutes 43 seconds less than main branch avg.) and finished at 21st Dec, 2022.

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Job	Failed Steps	Tests
build-dev	-     🔗	N/A	See Details
publish-latest	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

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⭕  changelog workflow has finished in 3 seconds (8 minutes 59 seconds less than main branch avg.) and finished at 21st Dec, 2022.

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Job	Failed Steps	Tests
changelog	-     🔗	N/A	See Details

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⭕  build-and-test-windows workflow has finished in 3 seconds (43 minutes 36 seconds less than main branch avg.) and finished at 21st Dec, 2022.

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Job	Failed Steps	Tests
windows-unittest-matrix	-     🔗	N/A	See Details
windows-unittest	-     🔗	N/A	See Details

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✅  prometheus-compliance-tests workflow has finished in 3 minutes 36 seconds (6 minutes 22 seconds less than main branch avg.) and finished at 21st Dec, 2022.

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Job	Failed Steps	Tests
prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  build-and-test workflow has finished in 40 minutes 19 seconds (19 minutes 38 seconds less than main branch avg.) and finished at 21st Dec, 2022.

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Job	Failed Steps	Tests
unittest-matrix (1.19, internal)	-     🔗	✅ 592  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	-     🔗	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	-     🔗	✅ 1474  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, internal)	-     🔗	✅ 592  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, extension)	-     🔗	✅ 528  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	-     🔗	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	-     🔗	✅ 528  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, processor)	-     🔗	✅ 1474  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-0)	-     🔗	✅ 2539  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-0)	-     🔗	✅ 2539  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	-     🔗	✅ 2456  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, other)	-     🔗	✅ 4394  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-1)	-     🔗	✅ 1871  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1871  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, exporter)	-     🔗	✅ 2456  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, other)	-     🔗	✅ 4394  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	-     🔗	✅ 55  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details
lint-matrix (receiver-0)	-     🔗	N/A	See Details
lint-matrix (receiver-1)	-     🔗	N/A	See Details
lint-matrix (processor)	-     🔗	N/A	See Details
lint-matrix (exporter)	-     🔗	N/A	See Details
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check-codeowners	-     🔗	N/A	See Details
checks	-     🔗	N/A	See Details
check-collector-module-version	-     🔗	N/A	See Details
build-examples	-     🔗	N/A	See Details
lint	-     🔗	N/A	See Details
unittest (1.19)	-     🔗	N/A	See Details
unittest (1.18)	-     🔗	N/A	See Details
cross-compile (darwin, amd64)	-     🔗	N/A	See Details
cross-compile (darwin, arm64)	-     🔗	N/A	See Details
cross-compile (linux, 386)	-     🔗	N/A	See Details
cross-compile (linux, amd64)	-     🔗	N/A	See Details
cross-compile (linux, arm)	-     🔗	N/A	See Details
cross-compile (linux, arm64)	-     🔗	N/A	See Details
cross-compile (linux, ppc64le)	-     🔗	N/A	See Details
cross-compile (windows, 386)	-     🔗	N/A	See Details
cross-compile (windows, amd64)	-     🔗	N/A	See Details
build-package (deb)	-     🔗	N/A	See Details
build-package (rpm)	-     🔗	N/A	See Details
windows-msi	-     🔗	N/A	See Details
publish-check	-     🔗	N/A	See Details
publish-dev	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

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✅  load-tests workflow has finished in 8 minutes 20 seconds (9 minutes 9 seconds less than main branch avg.) and finished at 21st Dec, 2022.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 19  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details

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[atoulme]

this created flakiness. Sometimes the last request sent by the batch was not gzipped. We account for it.

[atoulme]

also sometimes the last batch had just one event. We fix it here by doing a better job separating HEC events.

[dmitryax]

Please check linter failures