Rename dask_test suite to parallel_tests

[bchen1116]

fix #2591

[codecov]

Codecov Report

Merging #2657 (76a314b) into main (7c81cea) will increase coverage by 7.1%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main   #2657     +/-   ##
=======================================
+ Coverage   92.8%   99.9%   +7.1%     
=======================================
  Files        298     298             
  Lines      27161   27161             
=======================================
+ Hits       25199   27117   +1918     
+ Misses      1962      44   -1918     

Impacted Files	Coverage Δ
...ts/automl_tests/parallel_tests/test_automl_dask.py	100.0% <ø> (ø)
...ests/automl_tests/parallel_tests/test_cf_engine.py	100.0% <ø> (ø)
...ts/automl_tests/parallel_tests/test_dask_engine.py	100.0% <ø> (ø)
evalml/tests/automl_tests/test_automl.py	99.7% <0.0%> (+0.1%)	⬆️
evalml/tests/utils_tests/test_logger.py	100.0% <0.0%> (+0.6%)	⬆️
evalml/pipelines/utils.py	99.2% <0.0%> (+0.9%)	⬆️
...valml/tests/pipeline_tests/test_component_graph.py	100.0% <0.0%> (+1.1%)	⬆️
evalml/tests/component_tests/test_estimators.py	100.0% <0.0%> (+1.3%)	⬆️
evalml/tests/conftest.py	98.6% <0.0%> (+1.6%)	⬆️
evalml/tests/pipeline_tests/test_pipeline_utils.py	100.0% <0.0%> (+1.9%)	⬆️
... and 38 more

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