refactor(maven): Exit early for HTML-based metadata extraction (#27752)

lib/modules/datasource/maven/index.ts

@@ -114,6 +114,10 @@ export class MavenDatasource extends Datasource {
     dependency: MavenDependency,
     repoUrl: string,
   ): Promise<ReleaseMap> {
+    if (!repoUrl.startsWith(MAVEN_REPO)) {
+      return inputReleaseMap;
+    }
+
     const cacheNs = 'datasource-maven:index-html-releases';
     const cacheKey = `${repoUrl}${dependency.dependencyUrl}`;
     let workingReleaseMap = await packageCache.get<ReleaseMap>(
@@ -124,7 +128,6 @@ export class MavenDatasource extends Datasource {
       workingReleaseMap = {};
       let retryEarlier = false;
       try {
-        if (repoUrl.startsWith(MAVEN_REPO)) {
         const indexUrl = getMavenUrl(dependency, repoUrl, 'index.html');
         const res = await downloadHttpProtocol(this.http, indexUrl);
         const { body = '' } = res;
@@ -134,13 +137,9 @@ export class MavenDatasource extends Datasource {
             const { version, releaseTimestamp: timestamp } =
               match?.groups ?? /* istanbul ignore next: hard to test */ {};
             if (version && timestamp) {
-                const date = DateTime.fromFormat(
-                  timestamp,
-                  'yyyy-MM-dd HH:mm',
-                  {
+              const date = DateTime.fromFormat(timestamp, 'yyyy-MM-dd HH:mm', {
                 zone: 'UTC',
-                  },
-                );
+              });
               if (date.isValid) {
                 const releaseTimestamp = date.toISO();
                 workingReleaseMap[version] = { version, releaseTimestamp };
@@ -148,7 +147,6 @@ export class MavenDatasource extends Datasource {
             }
           }
         }
-        }
       } catch (err) /* istanbul ignore next */ {
         retryEarlier = true;
         logger.debug(