**Why?**
These values will be used to help build the mirroring diff.
It is helpful keeping it controlled in a constant.

**Links:**
- https://gitlab.com/gitlab-org/gitlab-ee/issues/10232
- https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/11478

Before the user had to choose between committing to a new branch,
committing to a new branch AND creating an MR, or committing to the
current branch regardless of whether or not it already has an MR.

This commit separates the creation of an MR from whether or not they
commit to an existing or new branch

- fixed getter spec with correct getter name

Closes #46192

Closes #45326

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/4541

This also makes the IDE generally available