CloudMigration - Display different error messages for create migration errors (#94683)

* start on tokens

* more error messages

* more handling

* rephrased with suggestions from Daniel

* separate gms parse method

* use translation

* refactor initial idea to use error obj

* use error dto result

* handle gms client

* clean logs and comments

* fix tests

* tests for gms

* test and lint

* lint

* one more handling from gms

* typing in fe

* use error interface

* use validation error

* remove unused gms error

* use errorlib and helper function in fe

* regen api

* use same error util

* one more error to handle

pkg/services/cloudmigration/cloudmigrationimpl/cloudmigration_noop.go

@@ -26,7 +26,7 @@ func (s *NoopServiceImpl) DeleteToken(ctx context.Context, uid string) error {
 }
 
 func (s *NoopServiceImpl) ValidateToken(ctx context.Context, cm cloudmigration.CloudMigrationSession) error {
-	return cloudmigration.ErrFeatureDisabledError
+	return cloudmigration.ErrMigrationDisabled
 }
 
 func (s *NoopServiceImpl) GetSession(ctx context.Context, uid string) (*cloudmigration.CloudMigrationSession, error) {
@@ -38,7 +38,7 @@ func (s *NoopServiceImpl) GetSessionList(ctx context.Context) (*cloudmigration.C
 }
 
 func (s *NoopServiceImpl) CreateSession(ctx context.Context, cm cloudmigration.CloudMigrationSessionRequest) (*cloudmigration.CloudMigrationSessionResponse, error) {
-	return nil, cloudmigration.ErrFeatureDisabledError
+	return nil, cloudmigration.ErrMigrationDisabled
 }
 
 func (s *NoopServiceImpl) DeleteSession(ctx context.Context, uid string) (*cloudmigration.CloudMigrationSession, error) {