Add baseline comparison results to pull requests for performance benchmarks

[rishabh6788]

Is your feature request related to a problem? Please describe

Continuing from #14553 creating this issue to track progress on adding feature that will also add baseline performance comparison results on the pull request after benchmark run has completed.

Describe the solution you'd like

opensearch-benchmark provided out of the box compare command that compares the benchmark results between two runs and publishes the results highlighting differences between each operation.
The idea is to extend the existing workflow (#14760) to also add the comparison results on the PR once the performance run has completed for the same PR.

Related component

Other

Describe alternatives you've considered

No response

Additional context

No response

[peternied]

[Triage - attendees 1 2]
@rishabh6788 Thanks for creating this issue, look forward to seeing a pull request that adds this functionality.

[rishabh6788]

All required changes have been merged, the feature is live now.
Apart from getting performance benchmark numbers, the users now will also see baseline comparison results as well.