fix(core-kernel): prevent watcher from calling app.reboot multiple times

[rainydio]

Summary

Watcher was calling app.reboot for every file that was changed.

Checklist

• Ready to be merged

[codecov]

Codecov Report

Merging #3834 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #3834   +/-   ##
========================================
  Coverage    91.87%   91.87%           
========================================
  Files          620      620           
  Lines        14787    14788    +1     
  Branches      1853     1853           
========================================
+ Hits         13585    13586    +1     
  Misses         938      938           
  Partials       264      264           

Flag	Coverage Δ
#functional	6.09% <0.00%> (-0.01%)	⬇️
#integration	9.58% <0.00%> (-0.01%)	⬇️
#unit	89.93% <100.00%> (+<0.01%)	⬆️

Impacted Files	Coverage Δ
...ackages/core-kernel/src/services/config/watcher.ts	91.66% <100.00%> (+0.75%)	⬆️

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