refactor: update experimental builder warnings

The "unit-test" builder is no longer considered experimental, so the warning has been removed.

The "jest" and "web-test-runner" builders are now deprecated and will be removed in version 22. The warnings have been updated to reflect this.

Author: alan-agius4

packages/angular/build/src/builders/unit-test/builder.ts

@@ -176,10 +176,6 @@ export async function* execute(
     return;
   }
 
-  context.logger.warn(
-    `NOTE: The "unit-test" builder is currently EXPERIMENTAL and not ready for production use.`,
-  );
-
   // Initialize the test runner and normalize options
   let runner;
   let normalizedOptions;

packages/angular_devkit/build_angular/src/builders/jest/index.ts

@@ -26,7 +26,7 @@ const execFile = promisify(execFileCb);
 export default createBuilder(
   async (schema: JestBuilderSchema, context: BuilderContext): Promise<BuilderOutput> => {
     context.logger.warn(
-      'NOTE: The Jest builder is currently EXPERIMENTAL and not ready for production use.',
+      'NOTE: The Jest builder is currently EXPERIMENTAL and will be removed in version 22.',
     );
 
     const options = normalizeOptions(schema);

packages/angular_devkit/build_angular/src/builders/web-test-runner/index.ts

@@ -23,8 +23,9 @@ import { writeTestFiles } from './write-test-files';
 export default createBuilder(
   async (schema: Schema, ctx: BuilderContext): Promise<BuilderOutput> => {
     ctx.logger.warn(
-      'NOTE: The Web Test Runner builder is currently EXPERIMENTAL and not ready for production use.',
+      'NOTE: The Web Test Runner builder is currently EXPERIMENTAL and will be removed in version 22.',
     );
+
     logBuilderStatusWarnings(schema, ctx);
 
     // Dynamic import `@web/test-runner` from the user's workspace. As an optional peer dep, it may not be installed