Cleaned up branch pat

[Yuehan-Lin]

No description provided.

[piyush286]

I think it might be good to delay these changes until we can get this feature done: Aggregate Perf Results From Multiple Benchmark Iterations. That might be a more appropriate time to clean and merge these changes.

Earlier, we didn't have the interleave feature for PerfNext, and hence, we had to use an arbitrary number to represent the baseline.

https://github.com/AdoptOpenJDK/openjdk-test-tools/blob/7e2faf7f6b3d26b2102ddcab4bd0cf5f89cc26a9/test-result-summary-client/src/Dashboard/Widgets/Graph/ODM.jsx#L27

Also, we'll need to add appropriate logic to use the correct baselines for different platforms. Most of those things would need to be covered in the Tabular Views for Comparing Baseline and Test Builds for Selected Platforms & Metrics feature, which is a higher priority issue than Jumpstart features.

[llxia]

Talked with @piyush286 , the main concern is that we do not want to wait too long for merging pat branch as the code diverges may result impossible to merge in the future. This PR is only for porting pat into master and simple code clean up. Any additional enhancement can be added once this PR is merged.