Ignore [] brackets while capturing date with UNIFIED_DATE_TIMESTAMP

[srilakshmikanthanp]

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Hi, I made a small fix that addresses the DateTimeParseException (#442) when parsing GC logs with RotatingGCLogFile. I’m not deeply familiar with GC internals or GC log formats, so this change is based on my understanding of the related code. Please review and advise if any improvements are needed. Thanks!

[kcpeppe]

Can you provide a matching test case into DateTimeStampTest?

[srilakshmikanthanp]

Hi @kcpeppe, I've added the unit test. Please review and let me know if any changes are needed.

[srilakshmikanthanp]

@microsoft-github-policy-service agree