claude: generate-release-notes slash command

[skriss]

What type of PR is this?

• Enhancement / New Feature
• Bug Fix
• Refactor
• Optimization
• Test
• Documentation Update

What this PR does / why we need it:

Adds a claude slash command for generating user-friendly release notes.

The command will prompt for the version, as well as whether to save output to a markdown file or to edit an existing GitHub release with the output.

Which issue(s) this PR fixes:

Updates #998

Related Issue/PR #

Additional information:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.03%. Comparing base (1f15d72) to head (9f5dce4).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1471      +/-   ##
==========================================
+ Coverage   80.55%   81.03%   +0.47%     
==========================================
  Files          44       44              
  Lines        2299     2299              
==========================================
+ Hits         1852     1863      +11     
+ Misses        328      321       -7     
+ Partials      119      115       -4     

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[fjglira]

I like this, we should suggest the use at the release issue, for example here #1350 at the release note section. I think we should have a release template to clone for every release or have a document with all the information. I'll check this with @FilipB