Add release notes for 2.19.0 release

[cwperks]

Description

Adds release notes for 2.19.0 release

• Category

Documentation

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.48%. Comparing base (df93ff4) to head (93da021).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5072      +/-   ##
==========================================
- Coverage   71.48%   71.48%   -0.01%     
==========================================
  Files         336      336              
  Lines       22625    22625              
  Branches     3601     3601              
==========================================
- Hits        16174    16173       -1     
- Misses       4651     4653       +2     
+ Partials     1800     1799       -1     

see 5 files with indirect coverage changes