[pkg/stanza] Fix issue where partial fingerprint could be matched to additional files

[djaglowski]

Description:

When a file is read before its length reaches the fingerprint size, we capture the contents of the file as a partial fingerprint. When additional data is written to the file, we begin reading from the previously known length, and ultimately create a new fingerprint and offset. However, we were not discarding the first known offset. The effect of this was that, for a brief period of time (about 3 poll cycles), if a new file was found that also started with the same partial fingerprint, we would begin reading the file from the end of the partial fingerprint.

Link to tracking Issue:

Fixes #20745

Testing:

Used test written by @maokitty in #20745

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test-windows duration(5 seconds) has decreased 31 minutes 37 seconds compared to main branch avg(31 minutes 42 seconds).

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⭕  build-and-test-windows workflow has finished in 5 seconds (31 minutes 37 seconds less than main branch avg.) and finished at 7th Apr, 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 49 seconds and finished at 7th Apr, 2023.

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✅  telemetrygen workflow has finished in 1 minute 11 seconds and finished at 7th Apr, 2023.

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✅  changelog workflow has finished in 1 minute 58 seconds and finished at 7th Apr, 2023.

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✅  prometheus-compliance-tests workflow has finished in 3 minutes 17 seconds (3 minutes 5 seconds less than main branch avg.) and finished at 7th Apr, 2023.

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✅  load-tests workflow has finished in 6 minutes 30 seconds (3 minutes 52 seconds less than main branch avg.) and finished at 7th Apr, 2023.

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✅  e2e-tests workflow has finished in 13 minutes and finished at 7th Apr, 2023.

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✅  build-and-test workflow has finished in 35 minutes 28 seconds (10 minutes 54 seconds less than main branch avg.) and finished at 7th Apr, 2023.

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