build: remove unreferenced tsconfig-build.json files (#30858)

These are no longer needed since Bazel generates a tsconfig for each compilation

PR Close #30858

packages/animations/browser/testing/tsconfig-build.json

@@ -1,29 +0,0 @@
-{
-  "extends": "../tsconfig-build.json",
-
-  "compilerOptions": {
-    "baseUrl": ".",
-    "rootDir": "../../",
-    "paths": {
-      "@angular/animations": ["../../../../dist/packages/animations"],
-      "@angular/animations/browser": ["../../../../dist/packages/animations/browser"],
-      "@angular/core": ["../../../../dist/packages/core"]
-    },
-    "outDir": "../../../../dist/packages/animations"
-  },
-
-  "files": [
-    "public_api.ts",
-    "../../../../node_modules/@types/hammerjs/index.d.ts",
-    "../../../../node_modules/@types/jasmine/index.d.ts",
-    "../../../../node_modules/zone.js/dist/zone.js.d.ts"
-  ],
-
-  "angularCompilerOptions": {
-    "annotateForClosureCompiler": true,
-    "strictMetadataEmit": false,
-    "skipTemplateCodegen": true,
-    "flatModuleOutFile": "testing.js",
-    "flatModuleId": "@angular/animations/browser/testing"
-  }
-}