fix: consistently rewrite Injector to INJECTOR (#23008)

In Ivy mode we rewrite references to Injector to INJECTOR in ngInjectableDef, to fix tree-shaking.

This changes the rewrite to happen always, even in non-Ivy mode, and makes Angular understand
INJECTOR across the board at runtime.

PR Close #23008

packages/core/src/di/injector.ts

@@ -145,7 +145,7 @@ export class StaticInjector implements Injector {
     records.set(
         Injector, <Record>{token: Injector, fn: IDENT, deps: EMPTY, value: this, useNew: false});
     records.set(
-        INJECTOR, <Record>{token: Injector, fn: IDENT, deps: EMPTY, value: this, useNew: false});
+        INJECTOR, <Record>{token: INJECTOR, fn: IDENT, deps: EMPTY, value: this, useNew: false});
     recursivelyProcessProviders(records, providers);
   }