Clean up tempfile usage outside of cell temp (SYN-4377)

[Cisphyx]

No description provided.

[codecov]

Codecov Report

Base: 96.28% // Head: 96.96% // Increases project coverage by +0.67% 🎉

Coverage data is based on head (70dbefd) compared to base (4f4de98).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2925      +/-   ##
==========================================
+ Coverage   96.28%   96.96%   +0.67%     
==========================================
  Files         215      215              
  Lines       42105    42093      -12     
==========================================
+ Hits        40541    40815     +274     
+ Misses       1564     1278     -286     

Flag	Coverage Δ
linux	96.96% <100.00%> (+0.83%)	⬆️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/axon.py	98.73% <100.00%> (-0.14%)	⬇️
synapse/common.py	98.21% <100.00%> (ø)
synapse/cortex.py	96.50% <100.00%> (-0.51%)	⬇️
synapse/lib/ast.py	98.78% <100.00%> (ø)
synapse/lib/cell.py	98.23% <100.00%> (+13.76%)	⬆️
synapse/lib/view.py	97.00% <100.00%> (-0.34%)	⬇️
synapse/tests/utils.py	94.46% <0.00%> (-1.55%)	⬇️
synapse/lib/coro.py	97.20% <0.00%> (-0.70%)	⬇️
synapse/lib/trigger.py	95.01% <0.00%> (-0.39%)	⬇️
... and 24 more

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