Add command to delete remote tag (fix #104845)

[gpoussel]

This PR fixes #104845 by creating a new "Delete Remote Tag" command to Git.

The action is available through Command Palette and through the "More Actions..." menu.

1. The user selects a tag
2. The user selects the remote to delete the tag from
3. The command git push --delete {remoteName} {tagName} is executed

[lszomoru]

@gpoussel, thank you very much for your contribution. I have manually posted the code to a new pull request - #170415.