fixup! fix(@angular/build): preserve entry-point displayName casing and flatten bundle names

Author: alan-agius4

packages/angular/build/src/builders/library/pipeline/entry-points.ts

@@ -65,7 +65,7 @@ function normalizeEntryPoint(
     );
   }
 
-  if (!/(?<!\.d)\.(?:ts|mts)$/.test(entryFilePath)) {
+  if (!/(?<!\.d)\.m?ts$/.test(entryFilePath)) {
     throw new Error(
       `Entry point '${key}' file path must be a TypeScript file ('.ts' or '.mts'): '${entryFilePath}'.`,
     );

packages/angular/build/src/builders/library/pipeline/entry-points_spec.ts

@@ -60,7 +60,6 @@ describe('entry-points pipeline', () => {
     });
 
     it('should replace nested slashes with dashes in secondary entry point name', () => {
-      expect(getEntryPointBundleName('my-lib', 'testing/http')).toBe('my-lib-testing-http');
       expect(getEntryPointBundleName('@my-scope/my-lib', 'testing/sub/deep')).toBe(
         'my-scope-my-lib-testing-sub-deep',
       );
@@ -273,27 +272,6 @@ describe('entry-points pipeline', () => {
       });
     });
 
-    it('should flatten nested secondary entry-point bundleName', () => {
-      const entryPoints = normalizeEntryPoints(
-        {
-          '.': './src/public-api.ts',
-          './testing/http': './testing/http/src/public-api.ts',
-        },
-        projectRoot,
-        packageJsonPath,
-        'my-lib',
-      );
-
-      expect(entryPoints.get('testing/http')).toEqual({
-        subpath: './testing/http',
-        name: 'testing/http',
-        displayName: 'my-lib/testing/http',
-        bundleName: 'my-lib-testing-http',
-        entryFilePath: join(projectRoot, 'testing/http/src/public-api.ts'),
-        isPrimary: false,
-      });
-    });
-
     it('should ignore non-TypeScript exports and static declaration files for secondary subpaths', () => {
       const rawExports = {
         '.': './src/public-api.ts',