build: update VSCode settings to limit auto-formatting on save to JS/TS files (#28784)

Previously, auto-formatting on save was enabled for all file types,
which meant also using default VSCode formatting settings for files
where this was not desirable - for example HTML files (such as
angular.io and docs examples templates) and JSON files (such as Firebase
configurations).
This was problematic for the following reasons:
- Unlike with JS/TS files, the formatting of other file types is not
  checked/enforced on CI.
- Formatting is subject to default VSCode settings and everyone's local
  VSCode settings overrides.
- Especially for docs examples files, changing the layout might require
  updating the wording in corresponding guides (e.g. when referring to
  line-numbers).

If we decide that we do want to lint those other file types as well
(which sounds like a good idea), we should do it in a way that ensures
consistent formatting and check the formatting on CI.

PR Close #28784

.vscode/settings.json

@@ -1,5 +1,10 @@
 {
-  "editor.formatOnSave": true,
+  "[javascript]": {
+    "editor.formatOnSave": true,
+  },
+  "[typescript]": {
+    "editor.formatOnSave": true,
+  },
   // Please install http://clang.llvm.org/docs/ClangFormat.html in VSCode to take advantage of clang-format
   "clang-format.executable": "${workspaceRoot}/node_modules/.bin/clang-format",
   "files.watcherExclude": {
@@ -16,4 +21,4 @@
     "**/dist": true,
   },
   "git.ignoreLimitWarning": true,
-}
+}