refactor(python): Simplify rust side of datetime

[eitsupi]

Since the Python side of the function is set up so that None does not come here, it does not seem to make sense for ambiguous to actually be an Option.

polars/py-polars/polars/functions/as_datatype.py

Lines 26 to 38 in 7a2f547

	def datetime_(
	year: int | IntoExpr,
	month: int | IntoExpr,
	day: int | IntoExpr,
	hour: int | IntoExpr | None = None,
	minute: int | IntoExpr | None = None,
	second: int | IntoExpr | None = None,
	microsecond: int | IntoExpr | None = None,
	*,
	time_unit: TimeUnit = "us",
	time_zone: str | None = None,
	ambiguous: Ambiguous | Expr = "raise",
	) -> Expr:

polars/py-polars/polars/functions/as_datatype.py

Line 134 in 7a2f547

ambiguous_expr = parse_into_expression(ambiguous, str_as_lit=True)

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.95%. Comparing base (7a2f547) to head (8388434).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-python/src/functions/lazy.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19459      +/-   ##
==========================================
+ Coverage   79.94%   79.95%   +0.01%     
==========================================
  Files        1534     1534              
  Lines      211059   211057       -2     
  Branches     2444     2444              
==========================================
+ Hits       168727   168747      +20     
+ Misses      41777    41755      -22     
  Partials      555      555              

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