Allow dots in group names to pass validation for Create Group and Edit Group forms
## What does this MR do?
Allows dots within group names to pass form validation when creating or editing a group.
## Are there points in the code the reviewer needs to double check?
Nope, pretty straight forward.
## Why was this MR needed?
Although group names with dots are allowed, our frontend validation mistakenly invalidates them
## Screenshots (if relevant)
#### Before:
#### After:
## Does this MR meet the acceptance criteria?
- [ ] ~~[Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added~~
- [ ] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [ ] ~~API support added~~
- Tests
- [ ] Added for this feature/bug
- [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
## What are the relevant issue numbers?
Related to: #24622
Closes #24903
See merge request !7723
