Also renames the MigrationActions component (which appears on each individual migration row) to SingleMigrationActions, so as not to be confused with MigrationActionsDropdownGroup (which are the migration-related actions for each migplan). Cleaned up some unused variables/imports in that file as well.
Resolves https://bugzilla.redhat.com/show_bug.cgi?id=2055658
Also renames the MigrationActions component (which appears on each individual migration row) to SingleMigrationActions, so as not to be confused with MigrationActionsDropdownGroup (which are the migration-related actions for each migplan). Cleaned up some unused variables/imports in that file as well.