speed up tests massively by specifying location

[danlipert]

Description

This PR specifies in the pytest configuration where the tests are located. While this does add some additional coupling in that devs will need to add their tests to this file when creating a new module, or adding tests to a nonstandard path, it speeds up running the tests massively.

168.28s vs 506.17s on my local

This PR also pins a dependency that caused an issue with PyTest 4

Refers/Fixes

n/a

Testing

Tested locally and with Docker

[codecov]

Codecov Report

Merging #5475 into master will decrease coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5475      +/-   ##
==========================================
- Coverage   29.61%   29.12%   -0.49%     
==========================================
  Files         242      242              
  Lines       20849    20849              
  Branches     3016     3016              
==========================================
- Hits         6174     6072     -102     
- Misses      14423    14529     +106     
+ Partials      252      248       -4

Impacted Files	Coverage Δ
app/kudos/test_views.py	0% <0%> (-100%)	⬇️
app/kudos/test_models.py	0% <0%> (-100%)	⬇️
app/kudos/test_utils.py	0% <0%> (-70.59%)	⬇️
app/app/context.py	0% <0%> (-48.15%)	⬇️
app/retail/helpers.py	28.57% <0%> (-42.86%)	⬇️
app/retail/templatetags/matches.py	62.5% <0%> (-37.5%)	⬇️
app/retail/templatetags/is_in_list.py	66.66% <0%> (-33.34%)	⬇️
app/kudos/views.py	15.63% <0%> (-6.47%)	⬇️
app/kudos/models.py	52.44% <0%> (-0.7%)	⬇️
app/dashboard/views.py	12.7% <0%> (ø)	⬆️
... and 1 more

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