Revert "Add pipeline.should_skip_featurization flag (#3849)"

[eccabay]

This reverts adding the should_skip_featurization_flag, since it introduced a release-blocking bug.

[codecov]

Codecov Report

Merging #3862 (c4a258c) into main (3c91659) will decrease coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #3862     +/-   ##
=======================================
- Coverage   99.7%   99.7%   -0.0%     
=======================================
  Files        344     344             
  Lines      36190   36185      -5     
=======================================
- Hits       36053   36048      -5     
  Misses       137     137             

Impacted Files	Coverage Δ
.../integration_tests/test_time_series_integration.py	100.0% <ø> (ø)
evalml/pipelines/time_series_pipeline_base.py	100.0% <100.0%> (ø)

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