[PM-2282] Make feature flags type safe (#8612)

Refactors the feature flags in ConfigService to be type safe. It also moves the default value to a centralized location rather than the caller defining it. This ensures consistency across the various places they are used.

bitwarden_license/bit-web/src/app/admin-console/providers/clients/clients.component.ts

@@ -42,7 +42,6 @@ export class ClientsComponent extends BaseClientsComponent {
 
   protected consolidatedBillingEnabled$ = this.configService.getFeatureFlag$(
     FeatureFlag.EnableConsolidatedBilling,
-    false,
   );
 
   constructor(

bitwarden_license/bit-web/src/app/admin-console/providers/providers-layout.component.ts

@@ -37,12 +37,10 @@ export class ProvidersLayoutComponent {
 
   protected showPaymentMethodWarningBanners$ = this.configService.getFeatureFlag$(
     FeatureFlag.ShowPaymentMethodWarningBanners,
-    false,
   );
 
   protected enableConsolidatedBilling$ = this.configService.getFeatureFlag$(
     FeatureFlag.EnableConsolidatedBilling,
-    false,
   );
 
   constructor(

bitwarden_license/bit-web/src/app/admin-console/providers/settings/account.component.ts

@@ -30,7 +30,6 @@ export class AccountComponent {
 
   protected enableDeleteProvider$ = this.configService.getFeatureFlag$(
     FeatureFlag.EnableDeleteProvider,
-    false,
   );
 
   constructor(

bitwarden_license/bit-web/src/app/admin-console/providers/setup/setup.component.ts

@@ -36,12 +36,10 @@ export class SetupComponent implements OnInit {
 
   protected showPaymentMethodWarningBanners$ = this.configService.getFeatureFlag$(
     FeatureFlag.ShowPaymentMethodWarningBanners,
-    false,
   );
 
   protected enableConsolidatedBilling$ = this.configService.getFeatureFlag$(
     FeatureFlag.EnableConsolidatedBilling,
-    false,
   );
 
   constructor(