[chore][exporter/splunkhec] add test to reproduce buffer capacity issue on splunk HEC buffer sender

[atoulme]

Adds a companion test to issue #20481 and PR #20482.

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test-windows duration(6 seconds) has decreased 33 minutes 25 seconds compared to main branch avg(33 minutes 31 seconds).

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⭕  changelog workflow has finished in 6 seconds (2 minutes 6 seconds less 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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⭕  build-and-test-windows workflow has finished in 6 seconds (33 minutes 25 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 53 seconds and finished at 29th Mar, 2023.

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✅  telemetrygen workflow has finished in 1 minute 19 seconds and finished at 29th Mar, 2023.

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✅  build-and-test workflow has finished in 34 minutes 56 seconds (15 minutes 4 seconds less than main branch avg.) and finished at 29th Mar, 2023.

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Job	Failed Steps	Tests
unittest-matrix (1.19, connector)	-     🔗	✅ 126  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, connector)	-     🔗	✅ 126  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, internal)	-     🔗	✅ 583  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	-     🔗	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, processor)	-     🔗	✅ 1557  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, internal)	-     🔗	✅ 583  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, extension)	-     🔗	✅ 544  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	-     🔗	✅ 1557  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	-     🔗	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	-     🔗	✅ 544  ❌ 0  ⏭ 0    🔗	See Details
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✅  prometheus-compliance-tests workflow has finished in 3 minutes 21 seconds (3 minutes 1 second less than main branch avg.) 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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✅  load-tests workflow has finished in 6 minutes 48 seconds (3 minutes 57 seconds less 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 (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 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
setup-environment	-     🔗	N/A	See Details

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✅  e2e-tests workflow has finished in 13 minutes 47 seconds 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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