uSync: v17.4.1 and v18.1.3 releases

Repo: KevinJump/uSync

Made the bad file name blocklist configurable
Converted the nightly build workflow to a manual prerelease trigger
Released v17.4.1 to NuGet
Synced v18/main (structured diff view, background processing mode fixes, revived DataTypeSerializers, configurable bad file name blocklist, js-yaml security pin)
Released v18.1.3 to NuGet