fix: DH-14657 Disconnect handling increase debounce timeout

[mattrunyon]

DH-14657

Increases the timeout to 1s. Immediately shows the disconnect icon on the user settings icon when disconnect happens and changes the tooltip (although it will be extremely difficult for the user to trigger that tooltip since the modal will block access to it 1 second later)

Here's how to test w/ ngrok (I couldn't switch between wired and wireless on my PC b/c I need to fix some wifi drivers apparently)

ngrok http 10000
VITE_CORE_API_URL=https://ngrok.link/jsapi npm start

Then open localhost:4000 in firefox and enable work offline from the File menu

[codecov]

Codecov Report

Merging #1347 (c69a915) into main (a4677eb) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #1347      +/-   ##
==========================================
- Coverage   45.95%   45.95%   -0.01%     
==========================================
  Files         493      494       +1     
  Lines       34414    34422       +8     
  Branches     8582     8587       +5     
==========================================
+ Hits        15814    15817       +3     
- Misses      18549    18554       +5     
  Partials       51       51              

Flag	Coverage Δ
unit	45.95% <50.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/code-studio/src/main/AppMainContainer.tsx	35.01% <50.00%> (+0.42%)	⬆️

... and 4 files with indirect coverage changes