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/compiler/src/constant_pool.ts

@@ -40,7 +40,8 @@ const KEY_CONTEXT = {};
 class FixupExpression extends o.Expression {
   private original: o.Expression;
 
-  shared: boolean;
+  // TODO(issue/24571): remove '!'.
+  shared !: boolean;
 
   constructor(public resolved: o.Expression) {
     super(resolved.type);