update triggers to use issues for opening docs issues

[emmyoop]

resolves dbt-labs/actions#162

Problem

PRs have to get labeled when we're already labeling the issues. Some PRs never make it to getting docs PRs created.

Solution

Trigger docs issues to be created when an issue has the user_docs label and is closed as completed.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.02%. Comparing base (b435e26) to head (f6b3e35).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9803      +/-   ##
==========================================
- Coverage   88.04%   88.02%   -0.02%     
==========================================
  Files         178      178              
  Lines       22461    22461              
==========================================
- Hits        19776    19772       -4     
- Misses       2685     2689       +4     

Flag	Coverage Δ
integration	85.41% <ø> (-0.02%)	⬇️
unit	61.73% <ø> (ø)

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[emmyoop]

The failing CI is unrelated to this PR and not blocking.

[QMalcolm]

Looks good! Thanks for doing this, it's gonna make life easier 🙂

A few typos in comments me maybe want to handle though