Reorganize Tests

[thehomebrewnerd]

Reorganize Tests

As the test suite has continued to grow, several tests seemed to be located in directories/files that did not align with the specific item being covered by the test. This PR attempt to resolve some of these issue and better place some tests in the directory or file that most closely aligns with the objective of the test.

[codecov]

Codecov Report

Merging #1303 (1b614ac) into main (34a5dac) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1303   +/-   ##
=======================================
  Coverage   98.38%   98.38%           
=======================================
  Files         134      135    +1     
  Lines       14473    14489   +16     
=======================================
+ Hits        14239    14255   +16     
  Misses        234      234           

Impacted Files	Coverage Δ
featuretools/tests/entityset_tests/test_dask_es.py	100.00% <ø> (ø)
featuretools/tests/entityset_tests/test_entity.py	100.00% <ø> (ø)
...aturetools/tests/entityset_tests/test_koalas_es.py	100.00% <ø> (ø)
...utational_backend/test_calculate_feature_matrix.py	99.44% <100.00%> (ø)
featuretools/tests/demo_tests/test_demo_data.py	100.00% <100.00%> (ø)
featuretools/tests/entityset_tests/test_es.py	98.71% <100.00%> (-0.14%)	⬇️
...etools/tests/entityset_tests/test_serialization.py	99.72% <100.00%> (+0.08%)	⬆️
...aturetools/tests/entityset_tests/test_timedelta.py	100.00% <100.00%> (ø)
...ools/tests/primitive_tests/test_primitive_utils.py	100.00% <100.00%> (ø)
featuretools/tests/synthesis/test_dask_dfs.py	100.00% <100.00%> (ø)
... and 5 more

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[rwedge]

Looks good!