Test: improvements to sharing links

[joyceerhl]

Refs: #176316, #183810, #185908

• anyOS @lszomoru
• anyOS @Yoyokrazy

Complexity: 5

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We've made further improvements to copying and sharing links from inside VS Code.

Test:

1. Open an Azure Repos repository in insiders.vscode.dev. Right click in the editor gutter and Copy vscode.dev Link for a line. Paste the link into your browser tab and verify that it takes you back to that specific line for Azure Repos
2. Open a GitHub repository that has been cloned with git to your local machine. Be on an unpublished branch. Right click in the editor gutter and Copy vscode.dev Link for a line. Verify that you are informed the branch is not yet published to the remote, and that the followup actions work and make sense.
3. Repeat step 2 for the following scenarios:
   • Have some local uncommitted changes (either staged or in working tree)
   • Be a couple of commits behind the remote
4. Enable window.commandCenter and workbench.experimental.share.enabled, reload window, and install GitHub Pull Requests and Issues pre-release
   • Ensure a Copy Markdown Link option is available from the share button next to the command center and that it works as expected
   • If you have an active editor selection, ensure that all the options from the share button include a deeplink to the editor selection

[lszomoru]

Ensure a Copy Markdown Link option is available from the share button next to the command center and that it works as expected

Do you mean "Copy GitHub Permalink as Markdown"?

[Yoyokrazy]

Also running into #186298, and same expectation for uncommitted changes, expected a dialog.