frontend: Settings: make websocket multiplexer a setting

[Vikaspal8923]

PR Summary

This PR makes the WebSocket multiplexer configurable from the frontend Settings page. Users can now enable or disable the multiplexer option from the app Settings UI and persist the choice in the application configuration.

Related Issue

Fixes #4505

Changes

• Added a new Settings control for WebSocket multiplexer in frontend/src/components/App/Settings/Settings.tsx
• Added helper logic to manage multiplexer behavior in frontend/src/helpers/websocketMultiplexer.ts
• Persisted the new config option in Redux via frontend/src/redux/configSlice.ts
• Added Storybook coverage for the Settings change in frontend/src/components/App/Settings/Settings.General.stories.storyshot
• Updated related story tests in frontend/src/components/App/Notifications/Notifications.stories.tsx
• Added translations for the new setting label in all supported locales under frontend/src/i18n/locales/*/translation.json
• Adjusted related K8s API hook logic and tests to ensure the new setting does not break existing data refresh behavior:
  • frontend/src/lib/k8s/api/v2/hooks.ts
  • frontend/src/lib/k8s/api/v2/useKubeObjectList.ts
  • frontend/src/lib/k8s/api/v2/useKubeObjectList.test.tsx

Steps to Test

1. Start the frontend app locally.
2. Open the Settings page.
3. Verify the new WebSocket multiplexer setting is visible.
4. Toggle the option and confirm the state is saved.
5. Ensure WebSocket-related data flows continue working correctly.

screenshot :
Screencast from 2026-04-11 03-19-08.webm

Notes for the Reviewer

• Please verify the new translation strings are correctly added across all locales.

[k8s-ci-robot]

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[illume]

There's a PR for this here:

• Add runtime configuration for experimental WebSocket multiplexer #4763

Apologies, it looks like I didn't link the PR to the issue or notice that you were assigned in early Feb. Maybe we can merge them together, and take bits from both.

[Vikaspal8923]

Ok