CloudMigrations: Introduce RBAC role for migration assistant (#98588)

* CloudMigrations: delete unused code

* CloudMigrations: add access control and protect API + navtree with action

* CloudMigrations: register access control roles

* CloudMigrations: gate frontend based with access control

* CloudMigrations: fix api tests

* CloudMigrations: add docs on new actions and roles

* CloudMigrations: dont interpolate vars to make it more greppable

* CloudMigrations: run prettier

pkg/services/cloudmigration/cloudmigrationimpl/cloudmigration_test.go

@@ -929,6 +929,7 @@ func setUpServiceTest(t *testing.T, withDashboardMock bool, cfgOverrides ...conf
 		&pluginstore.FakePluginStore{},
 		&pluginsettings.FakePluginSettings{},
 		actest.FakeAccessControl{ExpectedEvaluate: true},
+		fakeAccessControlService,
 		kvstore.ProvideService(sqlStore),
 		&libraryelementsfake.LibraryElementService{},
 		ng,