Create a simple browser test for Group Migration
Description
As a first step in designing comprehensive test coverage for Group Migrations, create a simple browser test for migrations a group from another instance. The test would cover the basic scenario of importing a group via e2e test and make sure this view functions correctly and the logic on the backend functions correctly as well by verifying that the UI indicated that the migration was a success.
In the future, we can build more depth on top of that.