TYP: Misc changes for pandas-stubs; use Protocol to avoid str in Sequence #55263
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The first commit addresses some type issues found by running mypy on the tests from pandas-stubs (one big issue is that Index/Series are not included in IndexLabel; there might be cases where that is correct but in many cases they should be included).
The second commit re-writes #47233 with the protocol version of Sequence.
Can split it in two PRs if one of them is controversial.