Add configurable UI and kernel timeouts

[PardhavMaradani]

Changes made in this Pull Request:

• The UI request timeout and async kernel request timeout are now configurable from dashboard settings
• Set imdclient socket timeout to the default (600 s) and cleanup settings descriptions

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dea8921) to head (3710a73).

Additional details and impacted files

Components	Coverage Δ
frontend	100.00% <100.00%> (ø)
backend	100.00% <100.00%> (ø)

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[read-the-docs-community]

Documentation build overview

📚 mdadash | 🛠️ Build #34646617 | 📁 Comparing 3710a73 against latest (dea8921)

  🔍 Preview build  

3 files changed

± autosummary/mdadash.backend.kernel.manager.html
± _modules/mdadash/backend/kernel/manager.html
± _modules/mdadash/backend/state/manager.html