fix(devops-copilot): Remove the mode toggle when the user has access to one mode only

[killiancolla]

Summary

Issue: QOV-1558

Disabled the mode toggle when the user does not have read-write access to prevent the toggle from being locked without knowing why

Screenshots / Recordings

Before	After

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

[RemiBonnet]

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 50.52%. Comparing base (8219801) to head (5bf1556).

Files with missing lines	Patch %	Lines
...configuration/section-ai-copilot-configuration.tsx	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2357      +/-   ##
===========================================
- Coverage    52.38%   50.52%   -1.87%     
===========================================
  Files          381      305      -76     
  Lines         7949     6243    -1706     
  Branches      2432     1832     -600     
===========================================
- Hits          4164     3154    -1010     
+ Misses        3008     2514     -494     
+ Partials       777      575     -202     

Flag	Coverage Δ
unittests	50.52% <66.66%> (-1.87%)	⬇️

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