Fix ArgumentError for commits with invalid timezone offsets

Vasilii Iakliushinrequested to merge
569387-fix-argument-error into master

What does this MR do and why?

Contributes to #569387 (closed)

Problem

When Git repositories contain commits with malformed or extreme timezone values that exceed Ruby's valid range (±18 hours), GitLab would crash with "ArgumentError: utc_offset out of range" when calling Time.strptime.

Solution

Add error handling to gracefully fallback to UTC when timezone parsing fails, ensuring GitLab remains functional while preserving the original timestamp data.

References

ArgumentError: utc_offset out of range in Git C... (#569387 - closed)

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Related to #569387 (closed)

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