[exporter/splunkhec] handle overCapacity error better when we are trying to complete a gzip buffer

[atoulme]

Description:
Make sure to not return an error if we are over capacity, just return that we cannot accept the event.

Link to tracking Issue:
Fixes #20481

Testing:
Will add tests.

Documentation:

[runforesight]

Foresight Summary

    
Major Impacts

TestScraper ❌ failed 1 times in 2 runs (50% fail rate).

TestScraper/cannot_authenticate ❌ failed 1 times in 2 runs (50% fail rate).

TestScraper/invalid_endpoint ❌ failed 1 times in 2 runs (50% fail rate).

TestScraper/metrics_golden ❌ failed 1 times in 2 runs (50% fail rate).

TestScraper/metrics_golden_sftp ❌ failed 1 times in 2 runs (50% fail rate).

build-and-test-windows duration(46 seconds) has decreased 32 minutes 45 seconds compared to main branch avg(33 minutes 31 seconds).

View More Details

⭕  build-and-test-windows workflow has finished in 46 seconds (32 minutes 45 seconds less than main branch avg.) and finished at 29th Mar, 2023.

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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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✅  check-links workflow has finished in 1 minute 38 seconds and finished at 29th Mar, 2023.

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

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✅  telemetrygen workflow has finished in 2 minutes 17 seconds (⚠️ 43 seconds more than main branch avg.) and finished at 29th Mar, 2023.

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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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✅  prometheus-compliance-tests workflow has finished in 5 minutes 48 seconds and finished at 29th Mar, 2023.

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

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✅  changelog workflow has finished in 5 minutes 6 seconds (⚠️ 2 minutes 53 seconds more than main branch avg.) and finished at 29th Mar, 2023.

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

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✅  load-tests workflow has finished in 17 minutes 19 seconds (⚠️ 6 minutes 34 seconds more than main branch avg.) and finished at 29th Mar, 2023.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 18  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details

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✅  e2e-tests workflow has finished in 12 minutes 6 seconds (2 minutes 41 seconds less than main branch avg.) and finished at 29th Mar, 2023.

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Job	Failed Steps	Tests
kubernetes-test (v1.26.0)	-     🔗	N/A	See Details
kubernetes-test (v1.25.3)	-     🔗	N/A	See Details
kubernetes-test (v1.24.7)	-     🔗	N/A	See Details
kubernetes-test (v1.23.13)	-     🔗	N/A	See Details

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⭕  build-and-test workflow has finished in 3 minutes 35 seconds (46 minutes 29 seconds less than main branch avg.) and finished at 29th Mar, 2023.

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Job	Failed Steps	Tests
unittest-matrix (1.20, receiver-1)	-     🔗	N/A	See Details
unittest-matrix (1.20, other)	-     🔗	N/A	See Details
unittest-matrix (1.19, other)	-     🔗	N/A	See Details
unittest (1.20)	-     🔗	N/A	See Details
unittest (1.19)	-     🔗	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
windows-msi	-     🔗	N/A	See Details
build-package (rpm)	-     🔗	N/A	See Details
publish-check	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details
publish-dev	-     🔗	N/A	See Details

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