Optimize code owners file section regex

What does this MR do and why?

We require a section at the beginning of the line. If it doesn't exist there, there's no need to search for it there. Since it doesn't cause a high load spike, then we can fix it as a performance issue: https://gitlab.com/gitlab-org/gitlab/-/issues/385883#note_1210910052

changed milestone to %15.7

added Category:Source Code Management backend bugperformance groupsource code typebug labels

assigned to @igor.drozdov

added devopscreate sectiondev labels

changed the description

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Category	Reviewer	Maintainer
backend	Hitesh Raghuvanshi (@hraghuvanshi) (UTC+5.5, 5.5 hours ahead of @igor.drozdov)	Matthias Käppler (@mkaeppler) (UTC+1, 1 hour ahead of @igor.drozdov)

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added 1 commit

• 8e43650f - Optimize code owners file section regex

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@hraghuvanshi could you please review this merge request?

requested review from @hraghuvanshi

approved this merge request

@hraghuvanshi, thanks for approving this merge request.

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added pipeline:mr-approved label

removed review request for @hraghuvanshi

requested review from @engwan

changed milestone to %15.8

added missed:15.7 label

approved this merge request

resolved all threads

enabled an automatic merge when the pipeline for 1c916e8b succeeds

merged