WIP: Add 'created' field to reportsummary and expose in UI (#939)

[mozfreddyb]

This only adds a created field during cache generation, which wouldn't make it work for old, cached reports. It also involved quite a bit of vue hackery, due to the data not being available during django page render. Maybe the model ought to change to take not only a collectionid but also a collection.created? This is also WIP because I'm literally dumping the Python created attribute into the JSON and reading it out in JS. There is no explicit serialization/parsing of the date and I'm not sure what format is going to be used. Heh.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.97%. Comparing base (ddb13cc) to head (91eff4c). Report is 84 commits behind head on master.

Files with missing lines	Patch %	Lines
server/covmanager/tasks.py	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #940      +/-   ##
==========================================
- Coverage   69.98%   69.97%   -0.01%     
==========================================
  Files         149      149              
  Lines        9229     9230       +1     
  Branches       90       90              
==========================================
  Hits         6459     6459              
- Misses       2749     2750       +1     
  Partials       21       21              

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[jschwartzentruber]

Fixed in https://github.com/MozillaSecurity/FuzzManager/commit/505b12a83afe1c624c4cf7167e5351c52aeefcb6