Optimizations for CommitReferenceFilter

What does this MR do and why?

Contributes to #360578 (closed)

Problem

Commit detection in CommitReferenceFilter can lead to high CPU consumption.

There are following reasons for that:

1. We create substrings from commit ids even if they have the same length
2. We iterate over the hash list of commits to find the matching commit..

Solution

Optimize commit matching logic

Screenshots or screen recordings

High CPU consumption by shas_eql? method

Before	After

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.