tools: fix failing release-proposal linter for LTS transitions

PR-URL: #60465 Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Marco Ippolito <[email protected]> Reviewed-By: Colin Ihrig <[email protected]>

Author: aduh95

tools/actions/lint-release-proposal-commit-list.mjs

@@ -26,9 +26,13 @@ if (commitListingStart === -1){
 commitList=changelog.replace(/(^.+\n###Semver-Major|\n###Semver-(Minor|Patch))Commits\n/gs,'')
 .replaceAll('**(SEMVER-MAJOR)** ','');
 }else{
-constcommitListingEnd=changelog.indexOf('\n\n<a',commitListingStart);
-assert.notStrictEqual(commitListingEnd,-1);
-commitList=changelog.slice(commitListingStart,commitListingEnd+1);
+// We can't assume the Commits section is the one for this release in case of
+// a release to transition to LTS (i.e. with no commits).
+constreleaseStart=/\n<aid="(\d+\.\d+\.\d+)"><\/a>\n\n##\d+-\d+-\d+,Version\1/.exec(changelog);
+assert.ok(releaseStart,'Could not determine the start of the release section');
+constreleaseEnd=changelog.indexOf('\n\n<a',releaseStart.index);
+assert.notStrictEqual(releaseEnd,-1,'Could not determine the end of the release section');
+commitList=changelog.slice(commitListingStart,releaseEnd+1);
 }
 
 // Normalize for consistent comparison