fix(service-worker): deprecate versionedFiles in asset-group resources (#23584)

Since `versionedFiles` behaves in the exact same way as `files`, there
is no reaason to have both. Users should use `files` instead.

This commit deprecates the property and prints a warning when coming
across an asset-group that uses it. It should be completely removed in
a future version.

Note, it has also been removed from the default `ngsw-config.json`
template in angular/devkit#754.

PR Close #23584

aio/content/examples/service-worker-getting-started/src/ngsw-config.json

@@ -7,12 +7,9 @@
     "resources": {
       "files": [
         "/favicon.ico",
-        "/index.html"
-      ],
-      "versionedFiles": [
-        "/*.bundle.css",
-        "/*.bundle.js",
-        "/*.chunk.js"
+        "/index.html",
+        "/*.css",
+        "/*.js"
       ]
     }
   }, {
@@ -25,4 +22,4 @@
       ]
     }
   }]
-}
+}