build: migrate determining if Ivy is enabled in typescript genrule files to use angular_ivy_enabled (#33983)

Use angular_ivy_enabled to determine if Ivy is being used for the ivy_test_selector.ts symbols.
Additionally, remove the reflect_metadata genrules as we not longer have a "jit" compile option
so all possible invocations result in the same generated file.  Instead we can just commit this
file.

PR Close #33983

packages/private/testing/src/angular_ivy_enabled.ts

@@ -7,6 +7,6 @@
  */
 
 /**
- * This variable shows the `blaze --define=compile=` value to make it available to runtime.
+ * This variable shows if Ivy should be enabled at runtime.
  */
-export const bazelDefineCompileValue = 'legacy';
+export const ivyEnabled = false;

packages/private/testing/src/ivy_test_selectors.ts

@@ -5,8 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-
-import {bazelDefineCompileValue} from './bazel_define_compile_value';
+import {ivyEnabled} from './angular_ivy_enabled';
 
 /**
  * A function to conditionally include a test or a block of tests only when tests run against Ivy.
@@ -24,7 +23,7 @@ import {bazelDefineCompileValue} from './bazel_define_compile_value';
  * ivyEnabled && it(...);
  * ```
  */
-export const ivyEnabled = 'aot' === (bazelDefineCompileValue as string);
+export {ivyEnabled};
 
 /**
  * A function to conditionally skip the execution of tests that are not relevant when