feat(compiler-cli): make enableIvy ngtsc/true equivalent (#28616)

Currently setting `enableIvy` to true runs a hybrid mode of `ngc` and `ngtsc`. This is counterintuitive given the name of the flag itself.

This PR makes the `true` value equivalent to the previous `ngtsc`, and `ngtsc` becomes an alias for `true`. Effectively this removes the hybrid mode as well since there's no other way to enable it.

PR Close #28616

packages/bazel/src/ng_module.bzl

@@ -76,7 +76,7 @@ def _enable_ivy_value(ctx):
     if strategy == "legacy":
         return False
     elif strategy == "aot":
-        return "ngtsc"
+        return True
     else:
         fail("unreachable")