E101 False positive in multiline string

I have a python model that contains rest endpoint queries defined as multi-line strings, i.e.

```
query = """
query ...
"""
```

`ruff` is reporting `E101 Indentation contains mixed spaces and tabs` for the text inside the string.

Technically this is correct as the indentation of the query does contain a mix of tab and spaces - but in general, I feel that `ruff` shouldn't try and lint a text block.

Note I observed this in a notebook - I've not tested in a py file

Start by reproducing E101 Indentation contains mixed spaces and tabs from the reported Python notebook example, then compare the behavior with an equivalent .py file because the report does not test one. Done means Ruff no longer reports E101 for indentation inside the multiline string while still detecting the issue in ordinary Python code.

Written by the indexing model from the issue text.