build(bazel): Turning on strictPropertyInitialization for Angular. (#24572)

All errors for existing fields have been detected and suppressed with a
`!` assertion.

Issue/24571 is tracking proper clean up of those instances.

One-line change required in ivy/compilation.ts, because it appears that
the new syntax causes tsickle emitted node to no longer track their
original sourceFiles.

PR Close #24572

packages/examples/common/pipes/ts/lowerupper_pipe.ts

@@ -18,7 +18,8 @@ import {Component} from '@angular/core';
   </div>`
 })
 export class LowerUpperPipeComponent {
-  value: string;
+  // TODO(issue/24571): remove '!'.
+  value !: string;
   change(value: string) { this.value = value; }
 }
 // #enddocregion