refactor(cluster-action-toolbar): change toolbar layout and components

[TheoGrandin74]

Summary

• Updated ClusterActionToolbar to accept a "heading" variant prop for better customization.
• Replaced ActionToolbar.Button with Button component for consistency.
• Adjusted button sizes and styles based on the variant.
• Modified ClusterOverview to pass the new variant prop.
• Updated ClusterCard to utilize the card variant for the action toolbar.
• Improved layout and spacing in the toolbar and card components.

Issue:

Screenshots / Recordings

Testing

• Changes tested locally in the relevant Console's pages and Storybooks
• yarn test or yarn test -u (if you need to regenerate snapshots)
• yarn format
• yarn lint

PR Checklist

• I followed naming, styling, and TypeScript rules (see .cursor/rules)
• I performed a self-review (diff inspected, dead code removed)
• I titled the PR using Conventional Commits with a scope when possible (e.g. feat(service): add new Terraform service) - required for semantic-release
• I only kept necessary comments, written in English (watch for useless AI comments)
• I involved a designer to validate UI changes if I am not a designer
• I covered new business logic with tests (unit)
• I confirmed CI is green (Codecov red can be accepted)
• I reviewed and executed locally any AI-assisted code

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 10 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (feat/new-nav/storage-settings@e7ade77). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...eature/src/lib/cluster-actions/cluster-actions.tsx	50.00%	5 Missing and 5 partials ⚠️

Additional details and impacted files

@@                       Coverage Diff                        @@
##             feat/new-nav/storage-settings    #2477   +/-   ##
================================================================
  Coverage                                 ?   43.39%           
================================================================
  Files                                    ?      671           
  Lines                                    ?    15400           
  Branches                                 ?     4530           
================================================================
  Hits                                     ?     6683           
  Misses                                   ?     7507           
  Partials                                 ?     1210           

Flag	Coverage Δ
unittests	43.39% <50.00%> (?)

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