Fix open commit in browser for some Gitlab repos

[jtraub]

• PR Description

This PR fixes #2131.

Here I just replaced .* with less greedy [^/] in the default https remote url regex. Domain name can not include slashes so it is safe to use this matcher.

Test suite checked SSH Gitlab urls and they worked fine but there were no check for https gitlab urls in the suite. So I decided to add a couple of tests for github with https remote urls just to be sure that they work properly too.

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go run scripts/cheatsheet/main.go generate)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• Docs (specifically docs/Config.md) have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[jesseduffield]

Nice work :)