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/compiler/testing/tsconfig-build.json

@@ -1,24 +0,0 @@
-{
-  "extends": "../tsconfig-build.json",
-
-  "compilerOptions": {
-    "baseUrl": ".",
-    "rootDir": "../",
-    "paths": {
-      "@angular/compiler": ["../../../dist/packages/compiler"],
-      "@angular/core": ["../../../dist/packages/core"]
-    },
-    "outDir": "../../../dist/packages/compiler"
-  },
-
-  "files": [
-    "testing.ts",
-    "../../../node_modules/zone.js/dist/zone.js.d.ts"
-  ],
-
-  "angularCompilerOptions": {
-    "annotateForClosureCompiler": true,
-    "skipMetadataEmit": true,
-    "skipTemplateCodegen": true
-  }
-}

packages/compiler/tsconfig-build.json

@@ -1,37 +0,0 @@
-{
-  "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "emitDecoratorMetadata": true,
-    "experimentalDecorators": true,
-    "noImplicitAny": true,
-    "strictNullChecks": true,
-    "strictPropertyInitialization": true,
-    "noFallthroughCasesInSwitch": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "outDir": "../../dist/packages/compiler",
-    "paths": {
-      "@angular/core": ["../../dist/packages/core"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "target": "es2015",
-    "skipLibCheck": true,
-    "lib": ["es2015", "dom"],
-    // don't auto-discover @types/node, it results in a ///<reference in the .d.ts output
-    "types": []
-  },
-  "files": [
-    "index.ts",
-    "../../node_modules/zone.js/dist/zone.js.d.ts"
-  ],
-
-  "angularCompilerOptions": {
-    "annotateForClosureCompiler": true,
-    "skipMetadataEmit": true,
-    "skipTemplateCodegen": true
-  }
-}