Jkmarx/remove node group

[jkmarx]

Resolves #1643

• Removes node group services, references, helper methods from UI
• Removes node group API, model, and serializer

[codecov-io]

Codecov Report

Merging #1744 into develop will decrease coverage by 0.49%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           develop    #1744     +/-   ##
==========================================
- Coverage    39.84%   39.35%   -0.5%     
==========================================
  Files          369      363      -6     
  Lines        25284    24863    -421     
  Branches      1277     1264     -13     
==========================================
- Hits         10075     9784    -291     
+ Misses       15209    15079    -130

Impacted Files	Coverage Δ
refinery/ui/source/js/workflows/ctrl.js	73.68% <ø> (-1.32%)	⬇️
refinery/core/models.py	58.13% <ø> (-0.39%)	⬇️
...nery/ui/source/js/file-browser/services/factory.js	75.49% <ø> (-1.53%)	⬇️
refinery/core/utils.py	32.45% <ø> (-2.55%)	⬇️
...urce/js/analysis-launch/services/config-service.js	16.66% <ø> (ø)	⬆️
...efinery/ui/source/js/analysis-launch/modal-ctrl.js	7.14% <0%> (+1.26%)	⬆️
refinery/core/tests.py	99.68% <100%> (-0.03%)	⬇️
.../file-browser/directives/node-selection-popover.js	91.66% <100%> (ø)	⬆️
...ui/source/js/tool-launch/ctrls/input-group-ctrl.js	84.31% <100%> (ø)	⬆️
refinery/core/urls.py	100% <100%> (ø)	⬆️
... and 8 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2d0a40b...284b9be. Read the comment docs.

[scottx611x]

Does the removal of NodeGroup break our current way of launching Analyses?

[jkmarx]

@scottx611x Node Groups was only used in the data set two browser. It was used initially for launching analyses in the data set 2.