Use detection aliases instead of combinedTestOnly for pure-union detections

[Copilot]

Following PR #247 (which converted isRepo's test URLs to use detection-name aliases), this PR does the same for every detection whose test suite was previously using combinedTestOnly.

What changed

Any detection that is a pure logical OR of sub-detections now lists those sub-detection names as aliases in its addTests() call instead of combinedTestOnly. For example:

// Before
TEST: addTests('isIssueOrPRList', combinedTestOnly);

// After
TEST: addTests('isIssueOrPRList', [
  'isIssueList',
  'isPRList',
]);

The aliases expand recursively via getTests() in collector.ts, so all positive and negative URL tests are now fully exercised.

Detections updated (15)

• isCommitList → ['isRepoCommitList', 'isPRCommitList']
• isGlobalIssueOrPRList → ['isGlobalPRList', 'isGlobalIssueList']
• isIssueList → ['isRepoIssueList', 'isGlobalIssueList', 'isMilestone']
• isIssueOrPRList → ['isIssueList', 'isPRList']
• isConversation → ['isIssue', 'isPRConversation']
• isPRList → ['isRepoPRList', 'isGlobalPRList']
• hasFileEditor → ['isEditingFile', 'isNewFile', 'isDeletingFile']
• hasReleaseEditor → ['isEditingRelease', 'isNewRelease']
• hasWikiPageEditor → ['isEditingWikiPage', 'isNewWikiPage']
• isRepoIssueOrPRList → ['isRepoPRList', 'isRepoIssueList', 'isRepoTaxonomyIssueOrPRList']
• hasRenderedText → ['isRepoRoot', 'isRenderedTextFile']
• hasComments → ['isPR', 'isIssue', 'isCommit', 'isTeamDiscussion', 'isSingleGist']
• hasRichTextEditor → ['hasComments', 'isNewIssue', 'isCompare', 'isRepliesSettings', 'hasReleaseEditor', 'isDiscussion', 'isNewDiscussion']
• hasCode → ['hasComments', 'isRepoTree', 'isRepoSearch', 'isGlobalSearchResults', 'isSingleFile', 'isGist', 'isCompare', 'isCompareWikiPage', 'isBlame']
• hasFiles → ['isCommit', 'isCompare', 'isPRFiles']

Kept as combinedTestOnly

• hasRepoHeader — defined as isRepo(url) && !isRepoSearch(url), which is a subset of isRepo, not a pure union. Using aliases here would fail the negative tests for isRepoSearch URLs.

Result

Tests: 21320 passed (up from 18073 — 3247 new tests)