chore(functional): integrate html reporting with Playwright

[ashrivastava-qa]

Because

• We want to integrate inbuilt HTML reporting with Playwright together with blob reporting

This pull request

• Creates blob reports (.zip) for the test run for each parallel running machine
• Merges the test reports from 8 parallel machines running the tests
• Creates a HTML dashboard to display the functional test run details using the merged .zip file
• Adds an additional Merge-Report workflow and playwright-functional-test-report job in the config file
• Generates a playwright-report/index.html in the artifacts section on CircleCI, clicking which displays the dashboard
• All the above steps are integrated for local PRs and nightly

Issue that this pull request solves

Closes: FXA-8998 FXA-9857

Checklist

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• [x] My commit is GPG signed.
• [ ] If applicable, I have modified or added tests which pass locally.
• [ ] I have added necessary documentation (if appropriate).
• [ ] I have verified that my changes render correctly in RTL (if appropriate).

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