ability to add a pr link to work submission

[owocki]

Description

ability to add a pr link to work submission. useful to have for if we ever want to reference that PR directly for any reason

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

ui, bounty, etc

Testing

tested it

Refers/Fixes

self

[codecov]

Codecov Report

Merging #900 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #900      +/-   ##
==========================================
+ Coverage   33.51%   33.52%   +0.01%     
==========================================
  Files          99       99              
  Lines        6117     6118       +1     
  Branches      735      735              
==========================================
+ Hits         2050     2051       +1     
  Misses       3972     3972              
  Partials       95       95

Impacted Files	Coverage Δ
app/dashboard/router.py	38.15% <ø> (ø)	⬆️
app/dashboard/helpers.py	29.09% <ø> (ø)	⬆️
app/dashboard/models.py	64.45% <100%> (+0.05%)	⬆️

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[mbeacom]

lgtm