Removed __traits_version__ from json files

Created by: jjenthought

The workflow is a dictionary which contains lists of dictionaries, so only the traits_version keys in the top level dict were being removed. This changed the function so it should do it recursively. It seems fine but the only test is a on a single hardcoded example at the minute. Refs. issue https://github.com/force-h2020/force-bdss/issues/134

Fixes #134 (closed)

Created by: codecov[bot]

Codecov Report

Merging #152 into master will increase coverage by 0.5%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #152     +/-   ##
=========================================
+ Coverage   91.87%   92.37%   +0.5%     
=========================================
  Files          38       38             
  Lines         972     1049     +77     
  Branches       72       93     +21     
=========================================
+ Hits          893      969     +76     
- Misses         75       76      +1     
  Partials        4        4

Impacted Files	Coverage Δ
force_bdss/io/workflow_writer.py	100% <100%> (ø)
force_bdss/core_evaluation_driver.py	93.58% <0%> (+3.7%)

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Created by: stefanoborini

flake