fix(@angular/build): check referenced files against native file paths

When checking for bundler context invalidation for any referenced files,
the native path format is now used to ensure that the watch files can
be correctly matched. This is particularly important for Windows due to
the differing path segment separator.

(cherry picked from commit d16a9aa)

Author: clydin

packages/angular/build/src/tools/esbuild/angular/source-file-cache.ts

@@ -36,6 +36,7 @@ export class SourceFileCache extends Map<string, ts.SourceFile> {
     for (let file of files) {
       file = path.normalize(file);
       invalid = this.loadResultCache.invalidate(file) || invalid;
+      invalid = extraWatchFiles.has(file) || invalid;
 
       // Normalize separators to allow matching TypeScript Host paths
       if (USING_WINDOWS) {
@@ -44,8 +45,6 @@ export class SourceFileCache extends Map<string, ts.SourceFile> {
 
       invalid = this.delete(file) || invalid;
       this.modifiedFiles.add(file);
-
-      invalid = extraWatchFiles.has(file) || invalid;
     }
 
     return invalid;