Catch signals for graceful fleet desktop exit

[dantecatalfamo]

#21256

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
• For Orbit and Fleet Desktop changes:
  • Manual QA must be performed in the three main OSs, macOS, Windows and Linux.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.34%. Comparing base (fb0f69c) to head (5c29e4a).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23054      +/-   ##
==========================================
- Coverage   63.35%   63.34%   -0.01%     
==========================================
  Files        1534     1534              
  Lines      144300   144300              
  Branches     3650     3650              
==========================================
- Hits        91417    91414       -3     
+ Misses      45671    45668       -3     
- Partials     7212     7218       +6     

Flag	Coverage Δ
backend	64.25% <ø> (-0.01%)	⬇️

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[lucasmrod]

Double checking: Should we update our https://github.com/fyne-io/systray version? (there's this related commit)

[dantecatalfamo]

Double checking: Should we update our https://github.com/fyne-io/systray version? (there's this related commit)

We could for sure, we'd just need to add an os.Exit(0) at the end of onExit. Maybe in another PR?

[lucasmrod]

LGTM, left a few questions.