Add issue type REST API instructions to GitHub skill

[kmcginnes]

Description

Adds instructions to the GitHub skill file for setting issue types via the REST API after creation. This documents the gh api command needed to assign issue types (Bug, Feature, Epic, Task, or Spike) since gh issue create does not support setting the type directly.

Validation

• Verified setting the issue type this way works correctly

Related Issues

N/A

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0 license.
• I have verified pnpm checks passes with no errors.
• I have verified pnpm test passes with no failures.
• I have covered new added functionality with unit tests if necessary.
• I have updated documentation if necessary.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.91%. Comparing base (c5affc5) to head (70a518b).
⚠️ Report is 102 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1597       +/-   ##
===========================================
+ Coverage   47.81%   64.91%   +17.10%     
===========================================
  Files         382      372       -10     
  Lines        8525     8382      -143     
  Branches     3159     3123       -36     
===========================================
+ Hits         4076     5441     +1365     
+ Misses       3070     2086      -984     
+ Partials     1379      855      -524     

Flag	Coverage Δ
unittests	64.91% <ø> (+17.10%)	⬆️

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