Reversing the GitHub Action for Linux Unit Tests

[ParthivNaresh]

We're going to reverse the GitHub Actions for Linux Unit Tests until we can figure out a way to achieve the code coverage reports via Codecov or another service.

Issue #1911 has been filed to track this.

[codecov]

Codecov Report

Merging #1920 (f9a5dba) into main (d60b851) will increase coverage by 100.0%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           main    #1920       +/-   ##
=========================================
+ Coverage      0   100.0%   +100.0%     
=========================================
  Files         0      267      +267     
  Lines         0    21400    +21400     
=========================================
+ Hits          0    21394    +21394     
- Misses        0        6        +6     

Impacted Files	Coverage Δ
...ta_checks_tests/test_class_imbalance_data_check.py	100.0% <0.0%> (ø)
...understanding_tests/test_permutation_importance.py	100.0% <0.0%> (ø)
evalml/data_checks/data_check_action_code.py	100.0% <0.0%> (ø)
evalml/tests/utils_tests/test_woodwork_utils.py	100.0% <0.0%> (ø)
...ression_pipeline_tests/test_baseline_regression.py	100.0% <0.0%> (ø)
...eature_selection/rf_classifier_feature_selector.py	100.0% <0.0%> (ø)
...ents/estimators/classifiers/catboost_classifier.py	100.0% <0.0%> (ø)
evalml/utils/base_meta.py	100.0% <0.0%> (ø)
...ts/estimators/classifiers/elasticnet_classifier.py	100.0% <0.0%> (ø)
evalml/utils/logger.py	100.0% <0.0%> (ø)
... and 257 more

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[dsherry]

LGTM