feat: DH-14431: Add shortcuts to cycle dashboards

[gzh2003]

Part of DH-14431. Introduces keyboard navigation shortcuts to cycle between dashboards.

Cmd/Ctrl + .: to cycle the active dashboard forward
Cmd/Ctrl + ,: to cycle the active dashboard backward

Changes:

• Add shortcuts to cycle dashboard to NavigationShortcuts.ts
• Registered the shortcuts as global context actions
• Add handleCycleDashboardForward and handleCycleDashboardBackward to manage cycling

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 47.25%. Comparing base (97098f2) to head (b13321c).

Files with missing lines	Patch %	Lines
packages/code-studio/src/main/AppMainContainer.tsx	0.00%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2470      +/-   ##
==========================================
- Coverage   47.28%   47.25%   -0.03%     
==========================================
  Files         729      729              
  Lines       39919    39939      +20     
  Branches     9992     9997       +5     
==========================================
  Hits        18875    18875              
- Misses      21033    21053      +20     
  Partials       11       11              

Flag	Coverage Δ
unit	47.25% <0.00%> (-0.03%)	⬇️

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