fix(bazel): do not typecheck core schematic files (#29876)

Currently for Angular Bazel projects, NGC needs to be run in the
"postinstall" NPM script in order to generate required summary files.

We need to update the postinstall `tsconfig` to not check/re-build the
`@angular/core` schematic code which has transitive dependencies
which are only available inside of a CLI project. As this is not guaranteed
to be the case with Angular Bazel projects, we need to make sure that
we don't check/re-build these files.

PR Close #29876

integration/bazel/angular-metadata.tsconfig.json

@@ -20,6 +20,7 @@
   ],
   "exclude": [
     "node_modules/@angular/bazel/**",
+    "node_modules/@angular/core/schematics/**",
     "node_modules/@angular/compiler-cli/**",
     "node_modules/@angular/**/testing/**",
     "node_modules/@angular/router/upgrade*"

packages/bazel/src/schematics/ng-add/files/angular-metadata.tsconfig.json.template

@@ -17,6 +17,7 @@
   ],
   "exclude": [
     "node_modules/@angular/bazel/**",
+    "node_modules/@angular/core/schematics/**",
     "node_modules/@angular/compiler-cli/**",
     "node_modules/@angular/**/testing/**",
     "node_modules/@angular/router/upgrade*"