Auto e2e improvement

[Mai-Saad]

• Currently, auto e2e generates the new_release from the latest dev, will be great to generate previous_stable from trunk as well
• Update WP to the latest version before running tests
• Every week or less, delete all the passed reports

[Miraeld]

Nothing to do with wp-rocket-e2e repo,
But everything has to be done in https://github.com/wp-media/auto-e2e

1. Dual plugin generation (lines 57-60, 135-141, 425-439, 476-488): Add configuration for previous_stable.zip alongside new_release.zip. The script should now generate two versions of each plugin per cycle - one from the develop branch (new_release) and one from the trunk branch (previous_stable). This requires adding new config properties for the previous stable zip names, updating the cloneOrUpdatePlugin() method to accept a branch parameter, modifying moveZipToPlugin() to accept a custom target name, and updating configureForTestSuite() to set the previousStableZip property. The main cycle in runCycle() needs to be restructured to generate both zips sequentially with a git clean -fdx between them to prevent build artifact contamination.

2. WordPress update before tests (lines 68-69, 241-253, 486): Add a config flag UPDATE_WORDPRESS and create a new updateWordPress() method that runs npx wp-env start --update to update WordPress to the latest version before running tests. This should be called in the cycle after updating the E2E repo but before running tests. If the update fails, it should log the error but not stop the test execution.

3. Smart test results cleanup (lines 307-362): Modify the deleteOldTestResults() method to only delete passed test results older than 7 days while keeping failed results indefinitely. This requires checking each old result directory for a cucumber-report.json file, calling analyzeCucumberReport() to determine if tests passed or failed, and only deleting directories where all tests passed. The cleanup should log how many passed vs failed reports were processed.

Error handling improvements needed:

• Lines 489-499: Add null check for resultTimestamp before attempting to analyze the cucumber report to prevent null pointer exceptions when no test results are saved
• Line 195: Change error message from hardcoded "No WP Rocket ZIP file found" to use this.pluginName for proper plugin-agnostic messaging
• Lines 135-141: Add git checkout <branch> before git reset --hard origin/<branch> to ensure the repository is actually on the correct branch when updating existing clones
• Lines 476-488: Add git clean -fdx between generating the two plugin versions to remove build artifacts and prevent contamination

Configuration changes:

• Add WP_ROCKET_PREVIOUS_STABLE_ZIP and BACKWPUP_PREVIOUS_STABLE_ZIP constants to specify the output filenames for trunk-based builds
• Add UPDATE_WORDPRESS: true flag to enable/disable WordPress updates (can be set to false via environment variable if needed)
• Keep 7-day retention for passed reports (changed from 4 days for all reports)