Revert "Add prophet regressor (#1704)"

[jeremyliweishih]

This reverts commit 82f21f1. Reverting due to flaky tests on main.

[codecov]

Codecov Report

Merging #1764 (1c2eee9) into main (73d1b8e) will decrease coverage by 0.1%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##             main    #1764     +/-   ##
=========================================
- Coverage   100.0%   100.0%   -0.0%     
=========================================
  Files         249      247      -2     
  Lines       19767    19598    -169     
=========================================
- Hits        19758    19589    -169     
  Misses          9        9             

Impacted Files	Coverage Δ
evalml/model_family/model_family.py	100.0% <ø> (ø)
evalml/pipelines/components/__init__.py	100.0% <ø> (ø)
evalml/pipelines/components/estimators/__init__.py	100.0% <ø> (ø)
...lines/components/estimators/regressors/__init__.py	100.0% <ø> (ø)
...alml/tests/model_family_tests/test_model_family.py	100.0% <ø> (ø)
evalml/utils/__init__.py	100.0% <ø> (ø)
evalml/utils/gen_utils.py	99.6% <ø> (-<0.1%)	⬇️
evalml/tests/component_tests/test_components.py	100.0% <100.0%> (ø)
evalml/tests/component_tests/test_utils.py	100.0% <100.0%> (ø)

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[angela97lin]

sadtime :[

[freddyaboulton]

😭