${pullRequest} in commit description and label does nothing

[karyon]

• GitLens Version: v2021.10.2305, v11.6.1

• Git Version: 2.33.1.windows.1

• VSCode Version: 1.61.2
• OS Version: Windows 10 19043

Steps to Reproduce:

1. Add ${pullRequest} to gitlens.views.formats.commits.label or gitlens.views.formats.commits.description. The settings UI offers ${pullRequest} as a variable to add.
2. observe how the commit pane does refresh, but its contents do not change

Hovering over a commit does make the PR link appear. In that case, the logs shows a couple getPullRequestForCommit entries. Adding ${pullRequest} to the commit description template does not make getPullRequestForCommit appear in the log.

[eamodio]

Adding ${pullRequest*} tokens to those format strings should not be allowed -- because querying for the pull requests as part of just showing the list is far too expensive to allow.