refactor(set-change-password): [Auth/PM-17649] Move and test compareInputs validator (#13553)

- Move the `compareInputs` validator to `libs/auth`
- Add tests for the `compareInputs` validator
- Delete the deprecated `InputsFieldMatch` class (inputs-field-match.validator.ts)

libs/auth/src/angular/index.ts

@@ -77,3 +77,6 @@ export * from "./two-factor-auth";
 
 // device verification
 export * from "./new-device-verification/new-device-verification.component";
+
+// validators
+export * from "./validators/compare-inputs.validator";