Ability to copy private GitLab's Private email from settings page
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### Problem to solve
Currently I've to type my private email address letter by letter.
<!-- What problem do we solve? -->
### Intended users
All private email feature 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.
Personas can be found at https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/ -->
### Further details
Saving up time
<!-- Include use cases, benefits, and/or goals (contributes to our vision?) -->
### Proposal
Probably by putting the email in a `<code>` element under or above the selection box
<!-- How are we going to solve the problem? Try to include the user journey! https://about.gitlab.com/handbook/journeys/#user-journey -->
### Permissions and Security
N/A
<!-- What permissions are required to perform the described actions? Are they consistent with the existing permissions as documented for users, groups, and projects as appropriate? Is the proposed behavior consistent between the UI, API, and other access methods (e.g. email replies)? -->
### Documentation
Not needed
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### Testing
I assume it's a risk-free proposal
<!-- What risks does this change pose? How might it affect the quality of the product? What additional test coverage or changes to tests will be needed? Will it require cross-browser testing? See the test engineering process for further guidelines: https://about.gitlab.com/handbook/engineering/quality/guidelines/test-engineering/ -->
### What does success look like, and how can we measure that?
Being able to copy email addresses
<!-- Define both the success metrics and acceptance criteria. Note that success metrics indicate the desired business outcomes, while acceptance criteria indicate when the solution is working correctly. If there is no way to measure success, link to an issue that will implement a way to measure this. -->
### Links / references
N/A
issue