(Plexos): Include date_from and date_to in setting max_active_power

[ktehranchi]

We currently assume that if a unit is available for only part of the year, designated by the date_from/date_to, then it is available for the entire year.

We do our date_from/date_to filtering here which correctly identifies which units should be included in the model:

R2X/src/r2x/parser/parser_helpers.py

Lines 26 to 27 in fb21275

	def filter_property_dates(system_data: pl.DataFrame, study_year: int):
	"""filters query by date_from and date_to"""

However, need to integrate that impact of partial calendar availability here:

R2X/src/r2x/parser/plexos.py

Line 1003 in fb21275

availability = mapped_records.get("available", None)

This impacts a very small number of units.