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

Author: josephperrott

packages/core/test/bundling/core_all/BUILD.bazel

@@ -28,17 +28,17 @@ ng_rollup_bundle(
 js_size_tracking_test(
     name = "size_test",
     src = "angular/packages/core/test/bundling/core_all/bundle.min.js",
+    # Ensures that this target runs with "--config=ivy" (aka Ivy). This is necessary
+    # because we don't run this test on CI currently, but if we run it manually, we need to
+    # ensure that it runs with Ivy for proper size comparisons.
+    angular_ivy_enabled = "True",
     data = [
         "bundle.golden_size_map_ivy.json",
         ":bundle",
     ],
     golden_file = "angular/packages/core/test/bundling/core_all/bundle.golden_size_map_ivy.json",
     max_byte_diff = 250,
     max_percentage_diff = 15,
-    # Ensures that this target runs with "--define=compile=aot" (aka Ivy). This is necessary
-    # because we don't run this test on CI currently, but if we run it manually, we need to
-    # ensure that it runs with Ivy for proper size comparisons.
-    required_compile_mode = "aot",
     source_map = "angular/packages/core/test/bundling/core_all/bundle.min.js.map",
     tags = [
         "ivy-only",
@@ -49,17 +49,17 @@ js_size_tracking_test(
 js_size_tracking_test(
     name = "size_test_view_engine",
     src = "angular/packages/core/test/bundling/core_all/bundle.min.js",
+    # Ensures that this target runs with `--config=view-engine`. This is
+    # necessary because we don't run this test on CI currently, but if we run it manually,
+    # we need to ensure that it runs with View Engine for proper size comparisons.
+    angular_ivy_enabled = "False",
     data = [
         "bundle.golden_size_map_view_engine.json",
         ":bundle",
     ],
     golden_file = "angular/packages/core/test/bundling/core_all/bundle.golden_size_map_view_engine.json",
     max_byte_diff = 250,
     max_percentage_diff = 15,
-    # Ensures that this target runs with "--define=compile=legacy" (View Engine). This is
-    # necessary because we don't run this test on CI currently, but if we run it manually,
-    # we need to ensure that it runs with View Engine for proper size comparisons.
-    required_compile_mode = "legacy",
     source_map = "angular/packages/core/test/bundling/core_all/bundle.min.js.map",
     tags = [
         "manual",

packages/core/test/bundling/util/BUILD.bazel

@@ -6,19 +6,9 @@ package(default_visibility = ["//visibility:public"])
 ts_library(
     name = "reflect_metadata",
     srcs = [
-        "src/reflect_metadata_aot.ts",
-        "src/reflect_metadata_jit.ts",
-        "src/reflect_metadata_legacy.ts",
-        ":metadata_switch",
+        "src/reflect_metadata.ts",
     ],
     module_name = "@angular/core/test/bundling/util/src/reflect_metadata",
     module_root = "src/reflect_metadata",
     deps = ["@npm//reflect-metadata"],
 )
-
-# See packages/core/BUILD.bazel.
-genrule(
-    name = "metadata_switch",
-    outs = ["src/reflect_metadata.ts"],
-    cmd = "echo import \"'./reflect_metadata_$(compile)';\" > $@",
-)

packages/core/test/bundling/util/src/reflect_metadata.ts

@@ -6,4 +6,4 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import './reflect_metadata_legacy';
+export const UNUSED = true;

packages/core/test/bundling/util/src/reflect_metadata_jit.ts

@@ -21,14 +21,14 @@ ng_module(
 
 ## Controls if Ivy is enabled. (Temporary target until we permanently switch over to Ivy)
 ##
-## This file generates `src/bazel_define_compile_value.ts` file which reexports
-## `--define=compile` value as `bazelDefineCompileValue` symbols so that runtime can detect
-## which mode it is running in.
+## This file generates `src/angular_ivy_enabled.ts` file which exports a truthy value
+## whether Ivy should be enabled based on the `--defined=angular_ivy_enabled` value so
+## runtime can detect which mode it is running in.
 ##
-## See: `//.bazelrc` where `--define=ivy=legacy` is defined as default.
-## See: `./src/bazel_define_compile_value.ts` for more details.
+## See: `//.bazelrc` where `--define=angular_ivy_enabled=false` is defined as default.
+## See: `./src/angular_ivy_enabled.ts` for more details.
 genrule(
-    name = "bazel_define_compile_value",
-    outs = ["src/bazel_define_compile_value.ts"],
-    cmd = "echo export const bazelDefineCompileValue = \"'$(compile)'\"\; > $@",
+    name = "angular_ivy_enabled",
+    outs = ["src/angular_ivy_enabled.ts"],
+    cmd = "echo export const ivyEnabled = \"'True'.toString() == '$(angular_ivy_enabled)'\"\; > $@",
 )

packages/core/test/bundling/util/src/reflect_metadata_legacy.ts

@@ -6,4 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-export const UNUSED = true;
+/**
+ * This variable shows if Ivy should be enabled at runtime.
+ */
+export const ivyEnabled = false;

packages/private/testing/BUILD.bazel

@@ -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