Tested without all required scopes and they are now logged properly.
Created a new slack app from manifest and it worked properly.
### Submitter checklist
- [ ] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!
- [ ] Ensure that the pull request title represents the desired changelog entry
- [ ] Please describe what you did
- [ ] Link to relevant issues in GitHub or Jira
- [ ] Link to relevant pull requests, esp. upstream and downstream changes
- [ ] Ensure you have provided tests - that demonstrates feature works or fixes the issue
Reworked docs to make managing slack apps easier. Removed Slack's legacy integration that just causes lots of user support problems.
see https://github.com/jenkinsci/slack-plugin/issues/884#issuecomment-2098300564
Testing done
Tested without all required scopes and they are now logged properly. Created a new slack app from manifest and it worked properly.