[AC-1782] Import can manage (#3453)

* Changed Import permissions validation to check if the user CanCreate a Collection

* Corrected authorized to import validation allowing import without collections when the user is admin

* Added validation to check if user can import ciphers into existing collections

* swapped feature flag flexible collections with org property

* Removed unused feature service from ImportCiphersController

* Improved code readability

* added null protection against empty org when checking for FlexibleCollections flag

src/Api/Vault/AuthorizationHandlers/Collections/BulkCollectionAuthorizationHandler.cs

@@ -76,6 +76,7 @@ public class BulkCollectionAuthorizationHandler : BulkAuthorizationHandler<BulkC
 
             case not null when requirement == BulkCollectionOperations.Update:
             case not null when requirement == BulkCollectionOperations.ModifyAccess:
+            case not null when requirement == BulkCollectionOperations.ImportCiphers:
                 await CanUpdateCollectionAsync(context, requirement, resources, org);
                 break;
 

src/Api/Vault/AuthorizationHandlers/Collections/BulkCollectionOperations.cs

@@ -18,4 +18,5 @@ public static class BulkCollectionOperations
     /// </summary>
     public static readonly BulkCollectionOperationRequirement ModifyAccess = new() { Name = nameof(ModifyAccess) };
     public static readonly BulkCollectionOperationRequirement Delete = new() { Name = nameof(Delete) };
+    public static readonly BulkCollectionOperationRequirement ImportCiphers = new() { Name = nameof(ImportCiphers) };
 }