Update release highlights on parameters.json format

[xjules]

Issue
Resolves #12453

Approach
Update release highlights

(Screenshot of new behavior in GUI if applicable)

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'just rapid-tests')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Add backport label to latest release (format: 'backport release-branch-name')

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.62%. Comparing base (4d46eaf) to head (d250a2e).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12507      +/-   ##
==========================================
- Coverage   90.67%   90.62%   -0.06%     
==========================================
  Files         434      430       -4     
  Lines       29570    29481      -89     
==========================================
- Hits        26814    26717      -97     
- Misses       2756     2764       +8     

Flag	Coverage Δ
cli-tests	37.87% <ø> (+0.15%)	⬆️
gui-tests	68.61% <ø> (-0.37%)	⬇️
performance-and-unit-tests	74.35% <ø> (+0.04%)	⬆️
test	38.58% <ø> (+0.15%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #12507 will not alter performance

_{Comparing xjules:docs_parameter_json (956b168) with main (4d46eaf)}

Summary

✅ 22 untouched

[jonathan-eq]

I think this should be fine @JHolba

[jonathan-eq]

LGTM!

[oyvindeide]

That the new format is easier to read is quite subjective, I would just emphasize that the group concept has been drop.

[xjules]

That the new format is easier to read is quite subjective, I would just emphasize that the group concept has been drop.

Correct. I meant more once we introduce new attributes (distributions, etc. ). So yes, I can drop it.

[scout-team-app]

Successfully created backport PR for version-18.0:

• [Backport version-18.0] Update release highlights on parameters.json format #12520