Add a way to show new and removed packages in the worklog

[EbonJaeger]

Right now, there is no easy way to see if a package has been added to, or removed from, the repository. The way I do it now for the news posts is I go through all the commits in the repo for the sync cycle trying to spot commit messages saying "Add at x", or anything about deprecation. This has proven to be very prone to me missing added and removed packages.

It would be great to be able to get a summary of these packages using the worklog.py tool.

[ianmjones]

This may be a crazy idea as I don't know how the weekly sync happens, but ...

One idea is to use labels added by committers when they merge a PR, and then maybe some form of tag on main to signify the point where the next sync happens.

When that tag is added, have a GH Action create an issue with a summary of the packages added, removed and updated since the previous sync tag, based on the labels.

We've been using a similar mechanism at work to create somewhat useful starter changelogs for releases, via CircleCI in our case. By default every PR is included, set as un-categorised if they don't have a label, and we have an "exclude-from-changelog" label we use for PRs that need not be included in the release notes. You could use a similar exclude label for chore PRs etc.

I do wonder how you'd be able to pick out when 2 or more packages are added in a single PR though, like with the PR that added snippetexpander, but also wtype as a dependency? 🤷