Refactor pypi release procss to avoid doing the prep twice

[vEpiphyte]

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[codecov]

Codecov Report

Merging #1960 (19e118e) into master (a77d683) will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1960      +/-   ##
==========================================
- Coverage   96.72%   96.57%   -0.16%     
==========================================
  Files         142      142              
  Lines       26991    26991              
==========================================
- Hits        26108    26066      -42     
- Misses        883      925      +42     

Flag	Coverage Δ
linux	96.57% <ø> (-0.16%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/tests/utils.py	93.56% <0.00%> (-2.20%)	⬇️
synapse/cortex.py	95.50% <0.00%> (-0.78%)	⬇️
synapse/lib/hiveauth.py	95.96% <0.00%> (-0.77%)	⬇️
synapse/lib/view.py	95.37% <0.00%> (-0.73%)	⬇️
synapse/lib/spawn.py	95.51% <0.00%> (-0.65%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/lib/layer.py	97.80% <0.00%> (-0.07%)	⬇️

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