Migrate to httpclient5 (#1030)

Co-authored-by: strangelookingnerd <strangelookingnerd@users.noreply.github.com>

Migrate from EE 8 to EE 9 (#1028)

Fix uploading file to thread (#1016)

Remove # consistently from channel name in file upload (#1004)

Modernize to Jenkins 2.440.3 (#992)

Co-authored-by: Moderne <team@moderne.io>

Modify `getChannelId` and `convertChannelNameToId` for efficient chan…

…nel ID retrieval (#977)

Allow user file upload to work (#967)

Introduce a channel name to ID cache (#965)

Add better error handling for scopes and add app manifest (#963)

Remove # from channel name when uploading file (#962)