test: retry Playwright tests in CI

[muneeb-ashraf]

Add two Playwright retries in CI while preserving zero retries for local runs. This allows transient wordpress.org timeouts to be retried without masking failures during local development.

Fixes #403

Testing

• Verified both Playwright projects resolve to 0 retries locally and 2 retries in CI.
• npx playwright test --config tests/e2e/playwright.config.js --list - 44 tests discovered.
• npm run test:unit -- --runInBand - 21 tests passed.
• npm run test:scripts - 79 tests passed.
• git diff --check

Use of AI Tools

AI assistance: Yes
Tool(s): OpenAI Codex
Model(s): GPT-5
Used for: Code and tests.

[github-actions]

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Props muneebashraf, iamchitti, joefusco.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.85%. Comparing base (909c9b5) to head (0d230ec).
⚠️ Report is 58 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #466      +/-   ##
============================================
- Coverage     96.36%   95.85%   -0.52%     
- Complexity      240      255      +15     
============================================
  Files            19       21       +2     
  Lines          2835     3014     +179     
============================================
+ Hits           2732     2889     +157     
- Misses          103      125      +22     

Flag	Coverage Δ
multisite	95.85% <ø> (-0.52%)	⬇️
phpunit	71.06% <ø> (+0.06%)	⬆️

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[i-am-chitti]

Tried it locally: 2 retries in CI, 0 on my machine, all 44 tests still found. Also checked the specs start fresh on a retry. So, no new flakiness.

#372 is already merged. So, no blocker here.

LGTM 🚀

Nit: @muneeb-ashraf Could you fill in the template's Use of AI Tools block (AI assistance: / Tool(s): / Model(s):)? The current PR description doesn't say which model.

[muneeb-ashraf]

Updated the PR description with the complete disclosure block, including the tool, model, and usage. Thanks for the catch.