fix: prevent app restart when editor setting change [INS-3668]

[CurryYangxx]

Close #6389

There is a historical logic when nunjucksPowerUserMode and showVariableSourceAndValue change the app will restart，in order to modify how variables are displayed

insomnia/packages/insomnia/src/ui/hooks/use-settings-side-effects.ts

Line 58 in 6c63b0d

useRestartSetting('showVariableSourceAndValue');

The purpose of this PR is to use other way to refresh editor

Changes:

• add a hook to listen showVariableSourceAndValue and nunjucksPowerUserMode variable change
  • one-line editor
  • code editor
• extract the init and clean up logic to external function
• run cleanup and init to reinitialize codeMirror editor
• delete old app restart logic