Custom item in the Clone Dropdown list
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### Release notes
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For people with more than Gitlab account, it's necessary configuring different Hosts entries in the SSH configuration. This causes that the git URI in the clone dropdownlist, needs to be changed manually.
eg:
```bash
Host gitlab.com
hostname gitlab.com
user git
IdentityFile ~/.ssh/id_rsa_gitlab_username1
IdentitiesOnly yes
Host gitlab.com.user2
hostname gitlab.com
IdentityFile ~/.ssh/id_rsa_gitlab_username2
user git
IdentitiesOnly yes
```
Then, for the `user2`, you need to copy and edit before executing the clone to something like:
`git clone git@gitlab.com.user2:org/folder/repo.git`
It would be great to count with a custom additional URI in the dropdown list, customizable from the Profile's settings.

### Problem to solve
<!-- What problem do we solve? Try to define the who/what/why of the opportunity as a user story. For example, "As a (who), I want (what), so I can (why/value)." -->
It is more a UX issue, on which it is necessary to change manually a URI that could be customized.
### Intended users
<!-- Who will use this feature? If known, include any of the following: types of users (e.g. Developer), personas, or specific company roles (e.g. Release Manager). It's okay to write "Unknown" and fill this field in later.
End users.
### User experience goal
<!-- What is the single user experience workflow this problem addresses?
For example, "The user should be able to use the UI/API/.gitlab-ci.yml with GitLab to <perform a specific task>"
https://about.gitlab.com/handbook/engineering/ux/ux-research-training/user-story-mapping/ -->
### Proposal
<!-- How are we going to solve the problem? Try to include the user journey! https://about.gitlab.com/handbook/journeys/#user-journey -->
- Option at Profile's settings that allows to add a custom git URI
- Then, the custom URI will be used in the "clone repository" dropdown list for adding an additional item.
### Further details
<!-- Include use cases, benefits, goals, or any other details that will help us understand the problem better. -->
issue