Allow for "Optional Long Running Tests" Public Build

[scbedd]

This PR updates the build yaml so that we can create another public build that will run only the Nightly and PyPy tests.

So, behavior is predicated based on the variable long_running_tests:

• Set to False, run only the regular test suite
• Set to True, run only the long running tests
• Left Blank, run both long running and regular tests

#4496

[adxsdk6]

Can one of the admins verify this patch?

[adxsdk6]

Can one of the admins verify this patch?

[codecov-io]

Codecov Report

Merging #4498 into master will decrease coverage by 3.9%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4498      +/-   ##
==========================================
- Coverage   53.37%   49.46%   -3.91%     
==========================================
  Files       10499     6297    -4202     
  Lines      220118   176444   -43674     
==========================================
- Hits       117486    87280   -30206     
+ Misses     102632    89164   -13468

Impacted Files	Coverage Δ
...afactory/azure/mgmt/datafactory/models/__init__.py	50.67% <0%> (-49.33%)	⬇️
...ights/azure/applicationinsights/models/__init__.py	51% <0%> (-49%)	⬇️
...e/cognitiveservices/vision/face/models/__init__.py	51.25% <0%> (-48.75%)	⬇️
...iveservices/search/entitysearch/models/__init__.py	51.25% <0%> (-48.75%)	⬇️
azure-eventgrid/azure/eventgrid/models/__init__.py	51.25% <0%> (-48.75%)	⬇️
...ration/azure/mgmt/datamigration/models/__init__.py	51.27% <0%> (-48.73%)	⬇️
...ure/mgmt/recoveryservicesbackup/models/__init__.py	51.46% <0%> (-48.54%)	⬇️
...ce/azure/mgmt/containerinstance/models/__init__.py	51.8% <0%> (-48.2%)	⬇️
...tiveservices/search/videosearch/models/__init__.py	52.08% <0%> (-47.92%)	⬇️
.../azure/mgmt/compute/v2018_10_01/models/__init__.py	52.46% <0%> (-47.54%)	⬇️
... and 4284 more

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