Flaky semaphore test

[rubvs]

Test failure when running make test with -race enabled:

=== RUN   TestConsumeLogsSemaphore
panic: test timed out after 10m0s
running tests:
	TestConsumeLogsSemaphore (10m0s)

goroutine 130 [running]:
testing.(*M).startAlarm.func1()
	/usr/local/go/src/testing/testing.go:2366 +0x265
created by time.goFunc
	/usr/local/go/src/time/sleep.go:177 +0x45

goroutine 1 [chan receive, 9 minutes]:
testing.(*T).Run(0xc0003d41a0, {0x103362ede, 0x18}, 0x1037051e0)
	/usr/local/go/src/testing/testing.go:1750 +0x851
testing.runTests.func1(0xc0003d41a0)
	/usr/local/go/src/testing/testing.go:2161 +0x86
testing.tRunner(0xc0003d41a0, 0xc0004dfb10)
	/usr/local/go/src/testing/testing.go:1689 +0x21f
testing.runTests(0xc0003569d8, {0x103daec40, 0x46, 0x46}, {0xc0004dfbb8?, 0xc0004dfc00?, 0x103e076e0?})
	/usr/local/go/src/testing/testing.go:2159 +0x8bf
testing.(*M).Run(0xc00036d2c0)
	/usr/local/go/src/testing/testing.go:2027 +0xf18
main.main()
	_testmain.go:187 +0x2be

goroutine 123 [chan receive, 9 minutes]:
github.com/elastic/apm-data/input/otlp_test.TestConsumeLogsSemaphore.func1({0xc0000d1c48?, 0x102416989?}, 0xc0005657a0)
	/Users/rubenvanstaden/github/elastic/apm-data/input/otlp/logs_test.go:231 +0x51
github.com/elastic/apm-data/model/modelpb.ProcessBatchFunc.ProcessBatch(0xc0001209f0, {0x103716b58, 0xc000132bd0}, 0xc0005657a0)
	/Users/rubenvanstaden/github/elastic/apm-data/model/modelpb/batch.go:42 +0x48
github.com/elastic/apm-data/input/otlp.(*Consumer).ConsumeLogsWithResult(0xc000161ec0, {0x103716b58, 0xc000132bd0}, {0xc0001209c0?, 0xc000664d2c?})
	/Users/rubenvanstaden/github/elastic/apm-data/input/otlp/logs.go:79 +0x5ca
github.com/elastic/apm-data/input/otlp_test.TestConsumeLogsSemaphore(0xc00022e9c0)
	/Users/rubenvanstaden/github/elastic/apm-data/input/otlp/logs_test.go:251 +0x4d2
testing.tRunner(0xc00022e9c0, 0x1037051e0)
	/usr/local/go/src/testing/testing.go:1689 +0x21f
created by testing.(*T).Run in goroutine 1
	/usr/local/go/src/testing/testing.go:1742 +0x826

goroutine 124 [select, 9 minutes]:
golang.org/x/sync/semaphore.(*Weighted).Acquire(0xc0001a4320, {0x103716a40, 0x104daf080}, 0x1)
	/Users/rubenvanstaden/go/pkg/mod/golang.org/x/[email protected]/semaphore/semaphore.go:74 +0x57a
github.com/elastic/apm-data/input/otlp.semAcquire({0x103716a40, 0x104daf080}, {0x103713358, 0xc0001a4320}, 0x1)
	/Users/rubenvanstaden/github/elastic/apm-data/input/otlp/trace_semaphore.go:32 +0x156
github.com/elastic/apm-data/input/otlp.(*Consumer).ConsumeLogsWithResult(0xc000161ec0, {0x103716a40, 0x104daf080}, {0xc0001209c0?, 0xc000664d2c?})
	/Users/rubenvanstaden/github/elastic/apm-data/input/otlp/logs.go:67 +0xd2
github.com/elastic/apm-data/input/otlp_test.TestConsumeLogsSemaphore.func2()
	/Users/rubenvanstaden/github/elastic/apm-data/input/otlp/logs_test.go:244 +0x75
created by github.com/elastic/apm-data/input/otlp_test.TestConsumeLogsSemaphore in goroutine 123
	/Users/rubenvanstaden/github/elastic/apm-data/input/otlp/logs_test.go:242 +0x454
FAIL	github.com/elastic/apm-data/input/otlp	601.765s

Reproduce

go clean -testcache
go test -race -v -failfast ./input/otlp