feat: use file watchers to track the LS CLI status (#48)

License status for LS CLI is now checked via file watchers instead of
periodic checks.

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This is **part 2 of 2 in a stack** made with GitButler:
- <kbd>&nbsp;2&nbsp;</kbd> #48 👈 
- <kbd>&nbsp;1&nbsp;</kbd> #47 
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Author: skyrpex