Remove now-unnecessary Python-to-Jsonnet conversion

[knoepfel]

Now that DE production uses valid Jsonnet files, we can remove the Python-to-Jsonnet conversion facility that was put in place during the configuration-system overhaul. Cleaning up the configuration system will be helpful as part of the source-proxy replacement, especially as we start assembling workflows using Jsonnet configuration facilities.

[codecov[bot]]

Codecov Report

Merging #516 (f7c52cc) into master (a6a81ce) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #516      +/-   ##
==========================================
- Coverage   93.86%   93.84%   -0.02%     
==========================================
  Files          44       44              
  Lines        2754     2730      -24     
  Branches      391      389       -2     
==========================================
- Hits         2585     2562      -23     
+ Misses        129      127       -2     
- Partials       40       41       +1     

Flag	Coverage Δ
python-3.6	93.27% <100.00%> (+0.01%)	:arrow_up:
python-3.9	93.36% <100.00%> (+0.05%)	:arrow_up:
python-pypy-3.7	93.42% <100.00%> (-0.06%)	:arrow_down:

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Impacted Files	Coverage Δ
src/decisionengine/framework/config/ValidConfig.py	100.00% <100.00%> (+4.65%)	:arrow_up:
src/decisionengine/framework/dataspace/maintain.py	98.11% <0.00%> (-0.95%)	:arrow_down:

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