[AC-1782] Flexible collections import behavior in Password Manager and Admin Console (#6888)

* Added logic to only return organisations where user has import permissions and collections that he manages on Import

* Changed the UnassignedCollections validation logic

* Added validation to check if the user is coming from AdminConsole on the import component

* Added import collection service abstraction to allow get admin collections

* Corrected feature flag reads on import component

* Refactor import component methods ngOnInit and performImport to improve codescene
Using FeatureFlag Observable

* Modified validation to allow import if user has organizations to import into

* Using the new organization flexiblecollections property on import

* Created collection-admin-import.service to return all the org collections to the import on Admin Console

* Small changes on import flexible collections

* Fix linting issues

* changed canAccessImport rules and deprecated canAccessImportExport

* Validating if user canAccessImportExport instead of admin before calling the handleOrganizationImportInit.

* AC-2095 - Corrected getAllAdminCollections from ImportCollectionAdminService to properly get all the collections on AdminConsole

* Reverting AC-2095

---------

Co-authored-by: Daniel James Smith <djsmith85@users.noreply.github.com>

libs/importer/src/services/import-collection.service.abstraction.ts

@@ -0,0 +1,5 @@
+import { CollectionView } from "@bitwarden/common/vault/models/view/collection.view";
+
+export abstract class ImportCollectionServiceAbstraction {
+  getAllAdminCollections: (organizationId: string) => Promise<CollectionView[]>;
+}