[dashboard] Improve context information to the stopping screen

[gtsiolis]

Problem to solve

When users are stopping a workspace, they are seeing a) a reference to the new friendly workspace name (ID) like
ivory-parrot-qknm55sf and b) the context URL like a link to the Pull Request.

This could still be improved by following the changes in #3594 and adding some semantic structure like referencing a pull request number, etc.

See also relevant topic in the community forum.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[gtsiolis]

Re-opening this as it's still an issue. See also #3594.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.