Reduce spurious CI test failures

[Sploder12]

Previously CI could fail while writing to JSON files, especially in snapshot tests. Now, snapshot tests and many daemon tests minimally rely on the filesystem so the chance of spurious filesystem failures should be reduced.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@602c754). Learn more about missing BASE report. Report is 318 commits behind head on main.

Files with missing lines	Patch %	Lines
src/daemon/daemon.cpp	0.00%	5 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3709   +/-   ##
=======================================
  Coverage        ?   88.85%           
=======================================
  Files           ?      256           
  Lines           ?    14559           
  Branches        ?        0           
=======================================
  Hits            ?    12937           
  Misses          ?     1622           
  Partials        ?        0           

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