fix(@angular/build): disable TypeScript removeComments option

Disables TypeScript's `removeComments` option to ensure important annotations like `/* @__PURE__ */`
and `/* vite-ignore */` are preserved. TypeScript's comment removal can be too aggressive,
potentially stripping out critical information needed by bundlers for dead code elimination.
Non-essential comments will be handled by the bundler, so removing them in TypeScript isn't necessary
and could lead to an increase in the final bundle size.

Closes #29470

(cherry picked from commit 1a3ef3b)

Author: alan-agius4

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

@@ -63,6 +63,9 @@ export abstract class AngularCompilation {
         enableResourceInlining: false,
         supportTestBed: false,
         supportJitMode: false,
+        // Disable removing of comments as TS is quite aggressive with these and can
+        // remove important annotations, such as /* @__PURE__ */ and comments like /* vite-ignore */.
+        removeComments: false,
       }),
     );
   }

packages/angular_devkit/build_angular/src/tools/webpack/plugins/typescript.ts

@@ -23,6 +23,9 @@ export function createIvyPlugin(
     sourceMap: buildOptions.sourceMap.scripts,
     declaration: false,
     declarationMap: false,
+    // Disable removing of comments as TS is quite aggressive with these and can
+    // remove important annotations, such as /* @__PURE__ */.
+    removeComments: false,
   };
 
   if (tsConfig.options.target === undefined || tsConfig.options.target < ScriptTarget.ES2022) {