is_in errors for String series in Categorical/Enum series

[mcrumiller]

Checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of Polars.

Reproducible example

>>> pl.Series(["a", "b"]).is_in(pl.Series(["a", "c"], dtype=pl.Categorical))
>>> pl.Series(["a", "b"]).is_in(pl.Series(["a", "c"], dtype=pl.Enum(["a", "c"])))

Log output

polars.exceptions.InvalidOperationError: `is_in` cannot check for Enum(Some(local), Physical) values in String data

Issue description

s1.is_in(s2) errors if s1 is string and s2 is cat/enum. String and cat/enum comparisons should be valid.

Expected behavior

Should work.

Installed versions

--------Version info---------
Polars:               0.20.9
Index type:           UInt32
Platform:             Linux-5.15.133.1-microsoft-standard-WSL2-x86_64-with-glibc2.35
Python:               3.12.1 (main, Jan 31 2024, 09:51:46) [GCC 11.4.0]

----Optional dependencies----
adbc_driver_manager:  0.9.0
cloudpickle:          3.0.0
connectorx:           <not installed>
deltalake:            0.15.3
fsspec:               2023.12.2
gevent:               24.2.1
hvplot:               0.9.2
matplotlib:           3.8.2
numpy:                1.26.4
openpyxl:             3.1.2
pandas:               2.2.0
pyarrow:              15.0.0
pydantic:             2.6.1
pyiceberg:            0.5.1
pyxlsb:               1.0.10
sqlalchemy:           2.0.27
xlsx2csv:             0.8.1
xlsxwriter:           3.1.9