[exporter/splunkhec] fix: overcapacity error when MaxContentLength is 0

[hvaghani221]

Description:
splunk_hec exporter always returns over capacity error when compression is enabled and MaxContentLength is 0

Link to tracking Issue: #17035

Testing:

Added unit test to verify it is always working

Documentation:

N/A

[runforesight]

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Major Impacts

build-and-test duration(52 minutes 9 seconds) has decreased 7 minutes 19 seconds compared to main branch avg(59 minutes 28 seconds).

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⭕  build-and-test-windows workflow has finished in 4 seconds (40 minutes 49 seconds less than main branch avg.) and finished at 16th Dec, 2022.

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Job	Failed Steps	Tests
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✅  check-links workflow has finished in 1 minute 25 seconds (1 minute 55 seconds less than main branch avg.) and finished at 16th Dec, 2022.

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✅  changelog workflow has finished in 1 minute 29 seconds (5 minutes 57 seconds less than main branch avg.) and finished at 16th Dec, 2022.

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✅  tracegen workflow has finished in 1 minute 38 seconds (2 minutes 3 seconds less than main branch avg.) and finished at 16th Dec, 2022.

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✅  prometheus-compliance-tests workflow has finished in 3 minutes 29 seconds (6 minutes 5 seconds less than main branch avg.) and finished at 16th Dec, 2022.

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✅  build-and-test workflow has finished in 52 minutes 9 seconds (7 minutes 19 seconds less than main branch avg.) and finished at 16th Dec, 2022.

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Job	Failed Steps	Tests
unittest-matrix (1.18, internal)	-     🔗	✅ 592  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, internal)	-     🔗	✅ 592  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, processor)	-     🔗	✅ 1474  ❌ 0  ⏭ 0    🔗	See Details
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unittest-matrix (1.19, extension)	-     🔗	✅ 528  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, extension)	-     🔗	✅ 528  ❌ 0  ⏭ 0    🔗	See Details
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unittest-matrix (1.18, receiver-0)	-     🔗	✅ 2539  ❌ 0  ⏭ 0    🔗	See Details
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✅  load-tests workflow has finished in 8 minutes 8 seconds (8 minutes 47 seconds less than main branch avg.) and finished at 16th Dec, 2022.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
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loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 19  ❌ 0  ⏭ 0    🔗	See Details
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loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details

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[atoulme]

LGTM, a nit on the docs

[fatsheep9146]

The failed checks should be resolved. @harshit-splunk