Allow int-valued list filters in _get_args (water_year, year, month, day, peak_since)

`get_peaks` (merged in fca3d6c) introduced five `int | list[int] | None`
filters. The prior commit removed `_get_args`'s "list-of-non-str
pass-through" clause to catch user errors like `parameter_code=[60, 65]`
client-side — but the same clause was the only thing letting
`water_year=[2020]` through. CI surfaced this via
`test_get_peaks_water_year_filter`.

Add the five known int-list filter names to `_NO_NORMALIZE_PARAMS` so
they bypass string-iterable normalization. Existing string-list params
still validate, and `parameter_code=[60, 65]` still raises TypeError
client-side as intended.

If future int-list params are added, they must be opted in here — this
is intentional: the cost of one line per new param is a fair price for
not silently passing user errors to the API.

Author: thodson-usgs

dataretrieval/waterdata/utils.py

@@ -1185,15 +1185,21 @@ def _check_profiles(
 
 
 # Param names that ``_get_args`` must NOT push through ``_normalize_str_iterable``.
-# Scalar non-string knobs and ``list[float]`` params are detected by runtime
-# type; only string-iterable-shaped params with special handling need to be
-# named here: ``monitoring_location_id`` (validated separately), date-range
-# params (which may contain ``pd.NaT``/None or interval strings), and bbox
-# inputs (``list[float]``, sometimes a ``numpy.ndarray``).
+# Scalar non-string knobs are detected by runtime type; only iterable-shaped
+# params with special handling need to be named here:
+#   - ``monitoring_location_id`` is validated separately (AGENCY-ID format)
+#   - date-range params may contain ``pd.NaT``/None or interval strings
+#   - ``bbox``/``boundingBox`` are ``list[float]``, sometimes ``numpy.ndarray``
+#   - ``get_peaks``'s int-valued filters (``water_year`` etc.) are ``list[int]``
 _NO_NORMALIZE_PARAMS = _DATE_RANGE_PARAMS | {
     "monitoring_location_id",
     "bbox",
     "boundingBox",
+    "water_year",
+    "year",
+    "month",
+    "day",
+    "peak_since",
 }
 
 # Param names that must be a list of strings (never a single string).