Export User Directory as CSV

[androolloyd]

Description

Export CSV is now a celery task and it emails you a copy when its complete.

Small UI adjustment to make for more useable search queries, previously some keywords were not being filtered successfully, using the "keywords_exact" filter will allow for a better resultset.

Work for the auto complete bar is ongoing.

Refers/Fixes

Fixes the issues around CSV export as it was only exporting a single page before.

[codecov]

Codecov Report

Merging #7484 into master will decrease coverage by 0.04%.
The diff coverage is 18.18%.

@@            Coverage Diff             @@
##           master    #7484      +/-   ##
==========================================
- Coverage   26.12%   26.08%   -0.05%     
==========================================
  Files         307      307              
  Lines       30652    30726      +74     
  Branches     4539     4549      +10     
==========================================
+ Hits         8009     8015       +6     
- Misses      22369    22432      +63     
- Partials      274      279       +5     

Impacted Files	Coverage Δ
app/marketing/mails.py	10.81% <0.00%> (-0.11%)	⬇️
app/dashboard/tasks.py	24.82% <15.62%> (-8.10%)	⬇️
app/dashboard/views.py	10.50% <25.00%> (+<0.01%)	⬆️
app/dashboard/models.py	49.59% <33.33%> (-0.05%)	⬇️
app/dashboard/search_indexes.py	98.66% <100.00%> (-0.07%)	⬇️
app/quests/views.py	16.22% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
...eting/management/commands/assemble_leaderboards.py	39.73% <0.00%> (ø)

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