Add sentry to front end and backend.

[rwblair]

No description provided.

[codecov-io]

Codecov Report

Merging #672 into master will decrease coverage by 0.18%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #672      +/-   ##
==========================================
- Coverage   81.81%   81.62%   -0.19%     
==========================================
  Files          57       57              
  Lines        2233     2259      +26     
==========================================
+ Hits         1827     1844      +17     
- Misses        406      415       +9

Impacted Files	Coverage Δ
neuroscout/config/example_app.py	0% <0%> (ø)	⬆️
celery_worker/app.py	0% <0%> (ø)	⬆️
neuroscout/basic.py	89.47% <85.71%> (-3.39%)	⬇️
neuroscout/models/dataset.py	92.3% <0%> (-3.15%)	⬇️
neuroscout/populate/ingest.py	91.72% <0%> (-0.76%)	⬇️

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[adelavega]

I wonder if we should add sentry to the celery worker. Seems like a good idea actually.