BaseGitActivity: always enforce absolute URLs

[msfjarvis]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Always enforce leading slash since relative URLs are not always correct.

💡 Motivation and Context

An example of the case that should work but doesn't is /mnt/foo/pass-repo with default SSH port will have the leading / resulting in the path becoming mnt/foo/pass-repo that gets resolved as relative from $HOME which is obviously wrong.

💚 How did you test it?

Tested manually with the following configuration

• custom port, path in $HOME
• default port, path in $HOME
• custom port, path in /mnt/
• default port, path in /mnt/

📝 Checklist

• I formatted the code with the IDE's reformat action (Ctrl + Shift + L/Cmd + Shift + L)
• I reviewed submitted code

🔮 Next steps

T E S T S!

📸 Screenshots / GIFs

[msfjarvis]

Ugh this is a complicated situation. Everything works with local repos but as the failing tests suggest, remote URLs aren't really working out without sticking a leading slash into the URL.