Update cache availability checks to include S3 save capability in restore and save implementations

src/restoreImpl.ts

@@ -17,7 +17,7 @@ export async function restoreImpl(
     earlyExit?: boolean | undefined
 ): Promise<string | undefined> {
     try {
-        if (!utils.isCacheFeatureAvailable()) {
+        if (!canSaveToS3 && !utils.isCacheFeatureAvailable()) {
             core.setOutput(Outputs.CacheHit, "false");
             return;
         }

src/saveImpl.ts

@@ -22,7 +22,7 @@ export async function saveImpl(
 ): Promise<number | void> {
     let cacheId = -1;
     try {
-        if (!utils.isCacheFeatureAvailable()) {
+        if (!canSaveToS3 && !utils.isCacheFeatureAvailable()) {
             return;
         }