[K8s docs] Add release_1.31+ck1 release notes

[HomayoonAlimohammadi]

Overview

This PR adds the release notes for Charmed Kubernetes 1.31+ck1 bug fix release as a follow up to charmed-kubernetes/kubernetes-docs#870

Done

• [List of work items including drive-bys - remember to add the why and what of this work.]

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
  • Be sure to test on mobile, tablet and desktop screen sizes
• [List additional steps to QA the new features or prove the bug has been resolved]

Issue / Card

Fixes #

Screenshots

[If relevant, please include a screenshot.]

Help

QA steps - Commit guidelines

[webteam-app]

HomayoonAlimohammadi is not a collaborator of the repo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.64%. Comparing base (5e948fa) to head (51acada).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14579   +/-   ##
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  Coverage   69.64%   69.64%           
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  Files         120      120           
  Lines        3419     3419           
  Branches     1174     1174           
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  Hits         2381     2381           
  Misses       1013     1013           
  Partials       25       25           

[petesfrench]

LGTM