Fix Oracle JDK 21 e2e and warn on archived GA fallback (#1327)

Oracle no longer serves JDK 21 under /java/21/latest/, so a major-only
request falls back to the archived 21 GA build and reports version 21.
The e2e check required a concrete version for floating Oracle requests,
so the oracle 21 jobs failed.

Move floating Oracle e2e coverage to JDK 25 and keep a single oracle 21
job that exercises the archive fallback without the concrete-version
requirement. Warn when a major-only request falls back from /latest/ to
the archived GA release, since that build may lack security updates.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

dist/setup/182.index.js

@@ -82,6 +82,7 @@ class OracleDistribution extends _base_installer_js__WEBPACK_IMPORTED_MODULE_3__
             possibleUrls.push(`${ORACLE_DL_BASE}/${major}/latest/jdk-${major}_${platform}-${arch}_bin.${extension}`);
         }
         const floatingUrl = isOnlyMajorProvided ? possibleUrls[0] : undefined;
+        let latestUrlNotFound = false;
         possibleUrls.push(`${ORACLE_DL_BASE}/${major}/archive/jdk-${range}_${platform}-${arch}_bin.${extension}`);
         if (parseInt(major) < 17) {
             throw new Error('Oracle JDK is only supported for JDK 17 and later');
@@ -90,6 +91,9 @@ class OracleDistribution extends _base_installer_js__WEBPACK_IMPORTED_MODULE_3__
             const response = await this.http.head(url);
             if (response.message.statusCode === _actions_http_client__WEBPACK_IMPORTED_MODULE_5__/* .HttpCodes */ .Hv.OK) {
                 const floating = url === floatingUrl;
+                if (latestUrlNotFound) {
+                    _actions_core__WEBPACK_IMPORTED_MODULE_0__/* .warning */ .$e(`Oracle JDK ${major} is no longer available from the latest endpoint. Falling back to its archived GA release, which may not include security updates.`);
+                }
                 return {
                     url,
                     version: range,
@@ -100,6 +104,9 @@ class OracleDistribution extends _base_installer_js__WEBPACK_IMPORTED_MODULE_3__
                         : undefined
                 };
             }
+            if (url === floatingUrl) {
+                latestUrlNotFound = true;
+            }
             if (response.message.statusCode !== _actions_http_client__WEBPACK_IMPORTED_MODULE_5__/* .HttpCodes */ .Hv.NotFound) {
                 throw new Error(`Http request for Oracle JDK failed with status code: ${response.message.statusCode}`);
             }