Branch should be preserved when moving from the pipeline editor to the repository

Update

Consider solving #429332 (closed) which might resolve this issue as well

Summary

Branch selector is defaulting to main when moving from the pipeline editor to the repository

Steps to reproduce

1. Select a non main branch in the pipeline editor
2. move the the project repository
3. See that the branch selector is defaulted to main

What is the current bug behavior?

The branch selector is defaulted to main

What is the expected correct behavior?

When moving to the repository branch selector should preserve the selected branch and not switched back to main

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes