fix: ignore unmapped PerformanceIssue events

[officialasishkumar]

Summary

• ignore Audits PerformanceIssue events before passing them to the DevTools IssuesManager mapper, which currently has no handler for that issue code
• preserve the existing mapper/logging path for other issue codes
• add regression coverage that PerformanceIssue is ignored without collecting an issue or writing a console warning

Fixes #1850

Testing

• npm run build
• npm run test:no-build -- tests/PageCollector.test.ts
• npm run check-format

[Lightning00Blade]

Thanks for the PR,

I think we can merge after the rebase and update to tests.
And remove the the hard coded bit after we update the version of devtools.