Remove 24th hour from and add 0th hour to PartOfDay

[tamargrey]

Fixes bug where any timestamps from the 0th hour of a day wouldn't get transformed correctly to midnight

[thehomebrewnerd]

LGTM!

[codecov]

Codecov Report

Merging #2167 (1c1e5f7) into main (aac6e8c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2167   +/-   ##
=======================================
  Coverage   99.23%   99.23%           
=======================================
  Files         143      143           
  Lines       17199    17199           
=======================================
  Hits        17068    17068           
  Misses        131      131           

Impacted Files	Coverage Δ
.../tests/primitive_tests/test_transform_primitive.py	100.00% <ø> (ø)
...imitives/standard/datetime_transform_primitives.py	100.00% <100.00%> (ø)

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