test(tasks/coverage/typescript): collect more error files

[sapphi-red]

Improved the error file collection logic to pick up files like importMeta(module=system,target=es5).errors.txt​. Also added support for preserveconstenums​ and usedefineforclassfields.

[sapphi-red]

• fix(semantic): allow reserved keywords in typescript ambient contexts #15495
• test(tasks/coverage/typescript): collect more error files #15496 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #15496 will not alter performance

_{Comparing 11-09-test_tasks_coverage_typescript_collect_more_error_files (b3fb231) with main (e81587d)}

Summary

✅ 37 untouched

[Boshen]

Merge activity

• Nov 10, 4:35 AM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Nov 10, 4:35 AM UTC: Boshen added this pull request to the Graphite merge queue.
• Nov 10, 4:42 AM UTC: Merged by the Graphite merge queue.

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