Calling Firebase `validatePassword` outside of an Injection context

Is the running outside of injection context warning legitimate when using `validatePassword`?

My code:

```ts
import { EnvironmentInjector, inject, runInInjectionContext } from '@angular/core';
import { Auth, validatePassword } from '@angular/fire/auth';
import type { PasswordValidationStatus } from '@angular/fire/auth';
import type { AbstractControl, AsyncValidatorFn, ValidationErrors } from '@angular/forms';

import { getPasswordControlValue } from './util';

/**
* Validate against the Firebase Project Authentication Password Policy.
*
* Note: at this time there is no actual need for this because the policy only enforces length and
* other Validators already check for that. However it is nice to know how to do this.
*/
export const passwordFirebaseValidator = (): AsyncValidatorFn => {
const auth: Auth = inject(Auth);
const environmentInjector = inject(EnvironmentInjector);

return async (control: AbstractControl): Promise => {
const value = getPasswordControlValue(control);

// Like Validators.email, rely on Validators.required to check for blank passwords.
if (value == undefined) {
return null; // eslint-disable-line unicorn/no-null -- ValidatorFn returns null
}

const { passwordPolicy: _, ...status } = await runInInjectionContext(
environmentInjector,
async (): Promise => validatePassword(auth, value),
);

return status.isValid ? null : { firebasevalidator: status }; // eslint-disable-line unicorn/no-null
};
};
```

I added `EnvironmentInjector` and `runInInjectionContext` and that got rid of the warning, but is all this necessary? It would be nice if validation was simplier.

Start at the validatePassword entry point and the shown runInInjectionContext wrapper, then trace how AngularFire handles the Auth instance and injection context. Determine whether the warning is expected and whether the wrapper is required; done means documenting the correct calling pattern or simplifying validation without the warning.

Written by the indexing model from the issue text.