ff3f5a8d12
Previously, the following code would fail to compile:
```
let form: FormGroup<{email: FormControl<string | null>}>;
form = fb.group({
email: ['', Validators.required]
});
```
This is because the compiler was unable to properly infer the inner type of `ControlConfig` arrays in some cases. The same issue applies to `FormArray` as well under certain circumstances.
This change cleans up the `FormBuilder` type signatures to always use the explicit Element type, and to catch `ControlConfig` types that might fall through.
PR Close #45684
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