GH 25298: Add test for interval index in multiindex

[harinik]

Adds test for #25298

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

[harinik]

The Pyodide unit test failures are unrelated to this change

[natmokval]

thanks @harinik for adding the test. I am not sure this is the best place for it. Maybe the class TestIntervalIndexInsideMultiIndex in pandas/tests/indexing/interval/test_interval.py is better? Can you please rewrite the issue reference to a more common format # GH#<number of the issue>

[harinik]

Moved test and fixed issue reference