Show the matching protected branch pattern causing branch creation to fail
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### Problem to solve
When trying to create a protected branch without the required permissions, GitLab helpfully outputs a message explaining that the branch is protected. *However*, protected branches can be reserved in advance with globs, and it may not be obvious to the user which glob they matched.
### Intended users
Anyone creating branches
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### User experience goal
The user should be able to tell at a glance which part of the branch name was illegal
### Proposal
Expand the error message with the pattern that matched the branch name. The message currently says
```
You are not allowed to create protected branches on this project.
```
but I would like it to say something like:
```
You are not allowed to create protected branches on this project (branch name "$branch" matched protected branch pattern "$pattern")
```
### Further details
As an example affecting our own engineers, `gitlab-org/gitlab` seems to have a glob of the form `*auto-deploy*`, preventing any branch with `auto-deploy` as a substring from being created.
This is understandable, as it has to do with how GitLab.com is deployed, but GitLab also has a *feature* called **Auto Deploy**, and an external CI component called `auto-deploy-image`. Thus, engineers are likely to end up using `auto-deploy` as a substring in their branch name when working on a feature, and have a hard time figuring out why that branch name is protected. I have personally run into this, and so has @Alexand. The error message looks like this:
```
$ git push -u origin jcunha/set-auto-deploy-image-to-0-17-0
Enumerating objects: 16, done.
Counting objects: 100% (16/16), done.
Delta compression using up to 8 threads
Compressing objects: 100% (9/9), done.
Writing objects: 100% (9/9), 1.89 KiB | 646.00 KiB/s, done.
Total 9 (delta 7), reused 0 (delta 0), pack-reused 0
remote: GitLab: You are not allowed to create protected branches on this project.
To gitlab.com:gitlab-org/gitlab.git
! [remote rejected] jcunha/set-auto-deploy-image-to-0-17-0 -> jcunha/set-auto-deploy-image-to-0-17-0 (pre-receive hook declined)
error: failed to push some refs to 'git@gitlab.com:gitlab-org/gitlab.git'
```
the relevant line here is
```
remote: GitLab: You are not allowed to create protected branches on this project.
```
I would have liked to see
```
remote: GitLab: You are not allowed to create protected branches on this project
(branch name "jcunha/set-auto-deploy-image-to-0-17-0" matched protected branch pattern "*auto-deploy*")
```
### Permissions and Security
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### Links / references
issue