[PM-5971] Fix Payment Method Warning Bugs (#7923)

* Rework implementation of payment method warnings

* Move payment-method-warnings.component to module

* Moved timer/subscribe to app.component

* Remove unrelated refactoring

* Remaining feedback

* Add paymentMethodWarningsService tests

* Thomas' feedback

* fix tests

* Use barrel file imports

* Make banner work with new vault navigation

* Matt's feedback

libs/common/src/billing/models/billing-keys.state.ts

@@ -0,0 +1,13 @@
+import { BILLING_DISK, KeyDefinition } from "../../platform/state";
+import { PaymentMethodWarning } from "../models/domain/payment-method-warning";
+
+export const PAYMENT_METHOD_WARNINGS_KEY = KeyDefinition.record<PaymentMethodWarning>(
+  BILLING_DISK,
+  "paymentMethodWarnings",
+  {
+    deserializer: (warnings) => ({
+      ...warnings,
+      savedAt: new Date(warnings.savedAt),
+    }),
+  },
+);