deps: Remove dependency on @angular/bazel. (tensorflow#5774)

Removes the unused dependency on the npm package @angular/bazel.

The rules_nodejs documentation actually has recommended against its use:
https://github.com/bazelbuild/rules_nodejs/releases/tag/2.0.0

`For most applications, we no longer recommend depending on the @angular/bazel package. The only rule needed from it was ng_module which you can replace with the faster equivalent ts_library(use_angular_plugin=True)`

We transitioned from ng_module to ts_library(use_angular_plugin=True) in tensorflow#4376.

Steps to complete:
1. `yarn remove @angular/bazel`
2. Run the following commands: `bazel clean --expunge`, `rm -rf node_modules`, `yarn`
3. Build and run tensorboard and manually inspect it works.
4. Build and run tensorboard angular tests.

package.json

@@ -28,7 +28,6 @@
   },
   "homepage": "https://github.com/tensorflow/tensorboard#readme",
   "devDependencies": {
-    "@angular/bazel": "12.2.0",
     "@angular/cli": "^12.2.0",
     "@angular/compiler": "^12.2.0",
     "@angular/compiler-cli": "^12.2.0",