[N/land] Send email & SMS to assignee when report shortlisted

[nephila-nacrea]

Closes https://github.com/mysociety/societyworks/issues/4855.

[skip changelog]

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.25%. Comparing base (2ffc4b9) to head (c69391a).
⚠️ Report is 37 commits behind head on master.

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/Cobrand/Northumberland.pm	66.66%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5755      +/-   ##
==========================================
+ Coverage   82.66%   83.25%   +0.59%     
==========================================
  Files         455      456       +1     
  Lines       35512    37857    +2345     
  Branches     5783     6408     +625     
==========================================
+ Hits        29355    31519    +2164     
- Misses       4467     4604     +137     
- Partials     1690     1734      +44     

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[lizettal]

@dracos will you have a chance to review this one this week?

[dracos]

Happy for this to go on staging now, my comments are all just tidying, don't affect the behaviour, looks good

[dracos]

woot