`uses:` with fully qualified URLs raises two errors per use

[CaramelConnoisseur]

Describe the bug
When using actions hosted off GitHub, e.g. on internal git servers, using the full repo URL (e.g. https://git.example.com/example/example-action@v1) the add on tries to make it a GitHub URL (https://github.com/https/git.example.com/example/example-action@v1) and subsequently reports:

• Unable to resolve action 'https://git.example.com/example/example-action@v1', repository or version not found
• Expected format {owner}/{repo}[/path]@{ref}. Actual 'https://git.example.com/example/example-action@v1'

To Reproduce
Steps to reproduce the behavior:

1. Upload an action to any non-GitHub repo service, e.g. an on-prem Gitea instnace.
2. Create a workflow in VS Code using that workflow, e.g. uses: https://git.example.com/example/example-action@v1
3. See error

Expected behavior
The uses value should be recognised as a fully-qualified URL and the action should be queried from there rather than rewriting it to a GitHub URL.

Screenshots
N/A

Extension Version
v0.30.0

Additional context
N/A