Use absolute path for "Copy relative path" outside of workspace

[colin-grant-work]

What it does

Fixes a bug in the implementation of the Copy relative path command. If the file is outside the workspace, it now copies the absolute path.

How to test

1. Open a file outside your current workspace.
2. Open the editor context menu for that file.
3. Run the Copy relative path command.
4. Your copy buffer should contain the absolute path of the file. On master, it is empty.

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[vince-fugnitto]

LGTM! 👍

I confirmed for files outside the workspace the Copy Relative Path command will add the full path to the clipboard (similarly to vscode).