feat: add support for setting severity on issues

[jamacku]

Also default back to Project RHEL in base JQL query

[codecov]

Codecov Report

Attention: Patch coverage is 24.13793% with 66 lines in your changes missing coverage. Please review.

Project coverage is 47.78%. Comparing base (4166450) to head (47137e7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cli.ts	5.35%	53 Missing ⚠️
src/schema/jira.ts	40.90%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   52.27%   47.78%   -4.50%     
==========================================
  Files           7        7              
  Lines         461      542      +81     
  Branches       38       38              
==========================================
+ Hits          241      259      +18     
- Misses        219      282      +63     
  Partials        1        1              

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