SDEV-5340 - output_json - use json.dump so output is formatted.

[dustinbleile]

Makes the returned json file more formatted, for viewing / grepping:

eg.

 341     "project": "MoHCCN_-_AML",                                                                                                                                                                                 347     "kbMatches": [
348         {
349             "kbVariant": "DNMT3A mutation",
350             "variant": "c7f8d62d6f20ebd7f1e0b136252729e0",
351             "variantType": "mut",
352             "kbVariantId": "#163:41"
353         },

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.26%. Comparing base (7f597ac) to head (0f1fccb).

Files with missing lines	Patch %	Lines
pori_python/ipr/main.py	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #110      +/-   ##
===========================================
- Coverage    83.46%   83.26%   -0.20%     
===========================================
  Files           18       18              
  Lines         2546     2546              
===========================================
- Hits          2125     2120       -5     
- Misses         421      426       +5     

Flag	Coverage Δ
unittests	83.26% <0.00%> (-0.20%)	⬇️

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