DEX-1246: pipeline_status for AssetGroup

[naknomum]

Pull Request Overview

• Add pipeline_status() (and GET API reference to it) to AssetGroup objects
• Only include preparation section, per ticket discussion

[codecov]

Codecov Report

Merging #744 (c1ca6ad) into main (856f459) will decrease coverage by 0.4%.
The diff coverage is 63.6%.

❗ Current head c1ca6ad differs from pull request most recent head 6dbaeae. Consider uploading reports for the commit 6dbaeae to get more accurate results

@@           Coverage Diff           @@
##            main    #744     +/-   ##
=======================================
- Coverage   74.6%   74.1%   -0.5%     
=======================================
  Files        227     227             
  Lines      21274   21448    +174     
  Branches    4047    4082     +35     
=======================================
+ Hits       15880   15913     +33     
- Misses      4239    4379    +140     
- Partials    1155    1156      +1     

Impacted Files	Coverage Δ
app/modules/asset_groups/models.py	76.1% <61.9%> (+0.3%)	⬆️
app/modules/asset_groups/schemas.py	99.1% <100.0%> (+<0.1%)	⬆️
app/modules/sightings/resources.py	55.1% <0.0%> (-24.7%)	⬇️
app/extensions/elasticsearch/__init__.py	79.5% <0.0%> (+0.1%)	⬆️
app/extensions/git_store/__init__.py	75.9% <0.0%> (+0.2%)	⬆️
app/modules/individuals/models.py	84.1% <0.0%> (+0.4%)	⬆️

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[bluemellophone]

LGTM