Update ci

[h1dden-da3m0n]

Description

This PR (series) aims to further clean up the plugin CI and to automate it further.
Additionally, it aims to unify the repo configuration across the plugins by syncing the available labels for PRs and Issues.

Change(s)

• update dependabot config slightly
• remove the useless 'on tag release release-draft workflow' (unneeded)
• update the release-drafter workflow to create and regularly update a bump version PR (part of release automation)
• update the build workflow and separate it from the test workflow (now provides incremental artefacts for PRs and Main pusches)
• add label-sync action to have unified labels across all plugin repos

Issue(s)

• n/a

TODO

• ensure JF_BOT_TOKEN is setup for the repo
• add a label-sync config file jellyfin/jellyfin-meta-plugins#7 is merged