chore: remove stale tsconfig.json

This tsconfig.json prevents fast round trip cycles in VsCode
as it relies on the package-dist folders to be filled.

modules/@angular/core/test/tsconfig.json

@@ -1,19 +0,0 @@
-{
-  "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "emitDecoratorMetadata": true,
-    "experimentalDecorators": true,
-    "module": "commonjs",
-    "moduleResolution": "node",
-    "outDir": "../../../../dist/packages-test/core/",
-    "paths": {
-      "rxjs/*": ["../../../../node_modules/rxjs/*"],
-      "@angular/*": ["../../../../dist/packages-dist/*"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "sourceRoot": ".",
-    "target": "es5"
-  }
-}