Add benchmark result comparison support

[kshyju]

This PR introduces changes to enable benchmark result comparisons with a baseline version. The pipeline updates include tagging builds from specific branches (e.g., release\4x) with a designated tag. During a benchmark run, the pipeline will download the benchmark results from the latest build with this tag and compare the current run's results against the baseline.

Sample run using my private branch: https://azfunc.visualstudio.com/internal/_build/results?buildId=197569&view=logs&j=6b6a182f-f93d-525d-58f1-7dd940856fb8&t=db2ecd77-6a75-517c-c5ff-de4cbedea6d5&l=27

• Backporting to the in-proc branch is not required
  • Otherwise: Link to backporting PR
• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• My changes do not require diagnostic events changes
  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• I have added all required tests (Unit tests, E2E tests)

[kshyju]

A run with the latest iteration of changes: https://azfunc.visualstudio.com/internal/_build/results?buildId=198297&view=logs&j=6b6a182f-f93d-525d-58f1-7dd940856fb8&t=db2ecd77-6a75-517c-c5ff-de4cbedea6d5&l=47