docs: remove all deprecated @stable jsdoc tags (#23210)

These are no longer needed as stable docs are computed as those that
do not have `@experimental` or `@deprecated` tags.

PR Close #23210

tools/public_api_guard/platform-browser-dynamic/testing.d.ts

@@ -1,6 +1,4 @@
-/** @stable */
 export declare class BrowserDynamicTestingModule {
 }
 
-/** @stable */
 export declare const platformBrowserDynamicTesting: (extraProviders?: StaticProvider[] | undefined) => PlatformRef;