Show warning when admin sets URL with http vs. https

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Description

There's a number of places in our admin settings where URL's are being set. If they use a http URL, they could be exposing their GitLab instance to security issues. We should be kind enough to warn them. 😄

What URL settings does this apply to?

• Plant UML
• Sourcegraph
• ...

Context

Here's the comment where this was brought up.