build(docs-infra): add @nocollapse tag-def to prevent warning (#26039)

See https://github.com/angular/angular/blob/master/packages/compiler-cli/src/transformers/nocollapse_hack.ts

PR Close #26039

aio/tools/transforms/angular-api-package/tag-defs/nocollapse.js

@@ -0,0 +1,7 @@
+// A fake annotation to prevent Closure compiler from modifying the
+// associated code.
+// See https://github.com/angular/angular/blob/master/packages/compiler-cli/src/transformers/nocollapse_hack.ts
+// We must provide a tag-def for it or the doc-gen will error.
+module.exports = function() {
+  return {name: 'nocollapse'};
+};