*: fetch latest versions release notes

[KaloyanTanev]

Slight QoL improvement for the release notes - now they fetch the latest versions of clients for our compatibility matrix. And for patches they copy the versions used of latest minors (as we do not re-test in Kurtosis for patches).

category: docs
ticket: none

[Copilot]

Pull request overview

This PR updates the testutil/genchangelog release-notes generator so the Compatibility Matrix is populated automatically: minor releases fetch latest upstream client versions from GitHub, and patch releases reuse the versions from the corresponding minor release.

Changes:

• Render Compatibility Matrix client versions dynamically via new tplData.Clients template fields.
• Add GitHub release lookups to fetch latest client versions (minor) or parse versions from the previous minor release notes (patch).
• Refresh Compatibility Matrix copy/legend and replace hardcoded client versions in the template.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
testutil/genchangelog/template.md	Switches the compatibility matrix from hardcoded versions to templated client versions and updates matrix prose/legend.
testutil/genchangelog/main.go	Adds client version resolution logic (latest vs. minor reuse) and injects resolved versions into template execution.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.55%. Comparing base (cd96ee2) to head (8b08d8a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4597      +/-   ##
==========================================
- Coverage   57.58%   57.55%   -0.03%     
==========================================
  Files         246      246              
  Lines       33675    33675              
==========================================
- Hits        19392    19383       -9     
- Misses      11843    11851       +8     
- Partials     2440     2441       +1     

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud