fix(coverage): skip non-file URLs when converting v8 coverage

[MFA-G]

Description

Fixes #11036.

V8CoverageProvider.convertCoverage calls fileURLToPath(result.url) unconditionally:

if (this.isIncluded(fileURLToPath(result.url))) {

If V8 reports a script whose URL is not a file: URL, fileURLToPath throws TypeError: The URL must be of scheme file (ERR_INVALID_URL_SCHEME) and the entire coverage run aborts — not just the offending entry. Real-world sources of such URLs:

• about:/React/Server/... injected by vitest-plugin-rsc
• data: inline modules
• blob: worker scripts

filterResult in packages/coverage-v8/src/index.ts already drops non-file:// URLs at the takeCoverage stage, so the primary path is protected. But coverage entries that never pass through filterResult still reach convertCoverage: merged blob reports (--merge-reports), externally written coverage JSON, and subprocess writers. Those still crash today.

Change

Skip non-file: entries in convertCoverage (with a debug line) instead of letting fileURLToPath throw, so the remaining file-backed scripts are still converted and reported.

// V8 can report scripts that are not backed by a file, e.g. "about:", "data:"
// or "blob:" URLs coming from virtual modules. `fileURLToPath` throws on those.
if (!result.url.startsWith(FILE_PROTOCOL)) {
  debug('Skipping non-file URL %s', result.url)
  continue
}

The check runs after the browser-mode URL normalization block just above it, so browser /@fs and root-relative URLs — which are rewritten to file:// there — are unaffected.

Test

test/coverage-test/test/non-file-urls.unit.test.ts drives convertCoverage with a mixed batch: one non-file entry (parameterized over about:, data: and blob:) plus one real file-backed script, and asserts the file-backed script still lands in the coverage map.

Verified it is a real regression test — on main without the provider change it fails with exactly the reported error:

Serialized Error: { code: 'ERR_INVALID_URL_SCHEME' }
 Test Files  1 failed (1)
      Tests  3 failed (3)

and passes with it:

 ✓ |unit| test/non-file-urls.unit.test.ts > non-file url about:/React/Server/some-virtual-module does not crash coverage conversion
 ✓ |unit| test/non-file-urls.unit.test.ts > non-file url data:text/javascript,export const a = 1 does not crash coverage conversion
 ✓ |unit| test/non-file-urls.unit.test.ts > non-file url blob:nodedata:0ac1a2e2-... does not crash coverage conversion
 Test Files  1 passed (1)
      Tests  3 passed (3)

Validation

• pnpm build — ok
• vitest run --project unit --project v8 in test/coverage-test: 156 passed, 1 skipped, 1 failure in test/on-failure.test.ts (inline snapshot of the coverage summary text). That failure reproduces on an unmodified checkout of main as well, so it is pre-existing and unrelated to this change.
• eslint clean on both touched files.

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