ci: Don't check PR title for drafts

[mathbunnyru]

High Level Overview of Change

This makes PR title check not run on draft PRs.

Context of Change

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.7%. Comparing base (57e4cbb) to head (419e215).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6573   +/-   ##
=======================================
  Coverage     79.7%   79.7%           
=======================================
  Files          878     878           
  Lines        68116   68116           
  Branches      7563    7554    -9     
=======================================
+ Hits         54300   54316   +16     
+ Misses       13816   13800   -16     

see 7 files with indirect coverage changes

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