Add cursor pagination to commit list

What does this MR do and why?

Adds cursor-based pagination to the commit list page, allowing users to navigate through commits using Previous/Next buttons and configure the page size.

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Enable the feature flag:

   Feature.enable(:project_commits_refactor)

2. Navigate to a project with many commits (e.g., /-/commits/main)
3. Verify:
   • Pagination controls appear when there are more commits than the page size
   • Clicking "Next" loads the next page
   • Clicking "Previous" returns to the previous page
   • Changing page size resets to the first page
   • Applying filters resets pagination

MR acceptance checklist

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Related issues

Closes #555379 (closed)