refactor(compiler-cli): having an `ɵinj` field no longer guarantees injectability (#41231)

When `ɵngDeclareInjector()` was implemented, the `factory` was moved
out to the `ɵfac` static property on the class. This check was not updated.

PR Close #41231

packages/compiler-cli/src/ngtsc/metadata/src/util.ts

@@ -223,6 +223,5 @@ function afterUnderscore(str: string): string {
 /** Returns whether a class declaration has the necessary class fields to make it injectable. */
 export function hasInjectableFields(clazz: ClassDeclaration, host: ReflectionHost): boolean {
   const members = host.getMembersOfClass(clazz);
-  return members.some(
-      ({isStatic, name}) => isStatic && (name === 'ɵprov' || name === 'ɵfac' || name === 'ɵinj'));
+  return members.some(({isStatic, name}) => isStatic && (name === 'ɵprov' || name === 'ɵfac'));
 }