Update packaging changes page

[malfisya]

This page https://help.getsol.us/docs/packaging/packaging-changes has not been updated since May '24. There are a few changes happened until recently. This issue is to track what has changed and when did it changed.

• monitoring.yml is now strongly suggested and there is a warning in CI
• AppStream metainfo is now required for all desktop packages
• ent is now part of starter requirement
• Document new taskfile.yml commands
• add more here

[Staudey]

• Whitelist requirement for static libs
• Mandatory rss field for monitoring.yml

I'll take a closer look when I'm not on my phone

[davidjharder]

@malfisya Is there anything else you can think of that we missed?

[malfisya]

Will add more:

• Checkbox added in PR template for Sync notes

[Staudey]

I left that one out on purpose because you see it anyway when you submit a PR (and, mainly, because I couldn't figure out a way to phrase it that didn't sound dumb)

[Staudey]

Wait, actually I did add it, even though it sounds dumb