feat: automate performance testing in CI pipeline

[prakharsingh-74]

Description

This PR introduces an automated performance testing suite integrated into the CI pipeline. It leverages the existing k6 framework to validate the relay's performance under load, with a specific focus on handling "heavy blocks" (blocks containing a large volume of transactions). The suite includes a daily scheduled run, support for manual triggers with custom parameters, and automated failure reporting via k6 thresholds.

Fixes #3851

Testing Guide

To test the performance workflow manually in GitHub Actions:

1. Navigate to the Actions tab in the repository.
2. Select the Performance Testing workflow from the sidebar.
3. Click Run workflow and select the branch (e.g., automate-performance-testing-in-ci-pipeline).
4. Choose a test_type (e.g., performance, load, or stress).
5. (Optional) Provide a target_rps for stress tests or a filter_test for specific scenarios.
6. Verify that the workflow correctly builds the relay, starts a local Hedera network (Solo), executes the k6 tests, and produces a summary in the job output.

[codacy-production]

Not up to standards ⛔

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

_{NEW Get contextual insights on your PRs based on Codacy's metrics, along with PR and Jira context, without leaving GitHub. Enable AI reviewer
TIP This summary will be updated as you push new changes.}