Remove stub changelog

[MrAlias]

Resolve #1275

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.21%. Comparing base (ed5643b) to head (9800921).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1276      +/-   ##
==========================================
+ Coverage   43.35%   44.21%   +0.86%     
==========================================
  Files         305      304       -1     
  Lines       32816    27713    -5103     
==========================================
- Hits        14226    12254    -1972     
+ Misses      17677    14728    -2949     
+ Partials      913      731     -182     

Flag	Coverage Δ
integration-test	?
integration-test-arm	?
integration-test-vm-x86_64-5.15.152	?
integration-test-vm-x86_64-6.10.6	?
k8s-integration-test	?
oats-test	?
unittests	44.21% <ø> (+<0.01%)	⬆️

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[grcevski]

LGTM!

[Copilot]

Pull request overview

Removes the repository’s stub CHANGELOG.md now that release notes are auto-generated, and updates contributor/releasing documentation to eliminate references to maintaining a changelog (per #1275).

Changes:

• Remove the CHANGELOG.md file from the repository.
• Update RELEASING.md to stop instructing authors to curate changes from the changelog for PR descriptions.
• Update CONTRIBUTING.md to remove guidance telling contributors to update CHANGELOG.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
RELEASING.md	Removes the step referencing curated changes from CHANGELOG.md.
CONTRIBUTING.md	Removes contributor instruction to update CHANGELOG.md.
CHANGELOG.md	Deletes the stub changelog file entirely.

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