[Feature] By default link to the pull-request in the commit message

[ghuntley]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

As the GitHub Action can be configured with a centralised CLA across many repositories (via remote-repository-name and remote-organization-name) having a commit message of "from pull-request $number" does not convey enough information.

Describe the solution you'd like

Something like this?