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/http/testing/tsconfig-build.json

@@ -1,26 +0,0 @@
-{
-  "extends": "../tsconfig-build.json",
-
-  "compilerOptions": {
-    "baseUrl": ".",
-    "rootDir": "../",
-    "paths": {
-      "@angular/core": ["../../../dist/packages/core"],
-      "@angular/http": ["../../../dist/packages/http"],
-      "rxjs/*": ["../../../node_modules/rxjs/*"]
-    },
-    "outDir": "../../../dist/packages/http"
-  },
-
-  "files": [
-    "public_api.ts"
-  ],
-
-  "angularCompilerOptions": {
-    "annotateForClosureCompiler": true,
-    "strictMetadataEmit": false,
-    "skipTemplateCodegen": true,
-    "flatModuleOutFile": "testing.js",
-    "flatModuleId": "@angular/http/testing"
-  }
-}

packages/http/tsconfig-build.json

@@ -1,27 +0,0 @@
-{
-  "extends": "../tsconfig-build.json",
-
-  "compilerOptions": {
-    "baseUrl": ".",
-    "rootDir": ".",
-    "paths": {
-      "@angular/core": ["../../dist/packages/core"],
-      "@angular/common": ["../../dist/packages/common"],
-      "@angular/platform-browser": ["../../dist/packages/platform-browser"]
-    },
-    "outDir": "../../dist/packages/http"
-  },
-
-  "files": [
-    "public_api.ts",
-    "../../node_modules/zone.js/dist/zone.js.d.ts"
-  ],
-
-  "angularCompilerOptions": {
-    "annotateForClosureCompiler": true,
-    "strictMetadataEmit": false,
-    "skipTemplateCodegen": true,
-    "flatModuleOutFile": "http.js",
-    "flatModuleId": "@angular/http"
-  }
-}