fix(@angular/build): support TypeScript isolatedDeclarations option

This change allows the use of TypeScript's isolatedDeclarations compiler
option by conditionally preserving the declaration and composite options
when isolatedDeclarations is enabled.

Previously, the Angular CLI forcefully set both declaration and composite
to false, which prevented the use of isolatedDeclarations as TypeScript
requires at least one of these options to be true when isolatedDeclarations
is set (TS5069 error):

```
✘ [ERROR] TS5069: Option 'isolatedDeclarations' cannot be specified without specifying option 'declaration' or option 'composite'. [plugin angular-compiler]
```

Author: cexbrayat

packages/angular/build/src/tools/angular/compilation/angular-compilation.ts

@@ -52,7 +52,6 @@ export abstract class AngularCompilation {
         suppressOutputPathCheck: true,
         outDir: undefined,
         sourceMap: false,
-        declaration: false,
         declarationMap: false,
         allowEmptyCodegenFiles: false,
         annotationsAs: 'decorators',

packages/angular/build/src/tools/esbuild/angular/compiler-plugin.ts

@@ -733,7 +733,10 @@ function createCompilerOptionsTransformer(
     return {
       ...compilerOptions,
       noEmitOnError: false,
-      composite: false,
+      // Allow declaration and composite when isolatedDeclarations is enabled
+      // TypeScript requires either declaration or composite to be true when isolatedDeclarations is set
+      declaration: compilerOptions.isolatedDeclarations ? compilerOptions.declaration : false,
+      composite: compilerOptions.isolatedDeclarations ? compilerOptions.composite : false,
       inlineSources: !!pluginOptions.sourcemap,
       inlineSourceMap: !!pluginOptions.sourcemap,
       sourceMap: undefined,