[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.

apps/web/src/app/admin-console/organizations/layouts/organization-layout.component.ts

@@ -58,7 +58,6 @@ export class OrganizationLayoutComponent implements OnInit, OnDestroy {
 
   protected showPaymentMethodWarningBanners$ = this.configService.getFeatureFlag$(
     FeatureFlag.ShowPaymentMethodWarningBanners,
-    false,
   );
 
   constructor(

apps/web/src/app/admin-console/organizations/members/components/member-dialog/member-dialog.component.ts

@@ -218,7 +218,6 @@ export class MemberDialogComponent implements OnDestroy {
       groups: groups$,
       flexibleCollectionsV1Enabled: this.configService.getFeatureFlag$(
         FeatureFlag.FlexibleCollectionsV1,
-        false,
       ),
     })
       .pipe(takeUntil(this.destroy$))

apps/web/src/app/admin-console/organizations/settings/account.component.ts

@@ -44,12 +44,10 @@ export class AccountComponent {
 
   protected flexibleCollectionsMigrationEnabled$ = this.configService.getFeatureFlag$(
     FeatureFlag.FlexibleCollectionsMigration,
-    false,
   );
 
   flexibleCollectionsV1Enabled$ = this.configService.getFeatureFlag$(
     FeatureFlag.FlexibleCollectionsV1,
-    false,
   );
 
   // FormGroup validators taken from server Organization domain object