tests

Implement support for retaining Pandas index #2577

Job	Run time
Setup workflow	4s
Run pre-commit	16s
UI tests on Python 3.9, ubuntu-latest	1m 57s
Unit tests on Python 3.9, ubuntu-latest	26m 31s
Core tests on Python 3.12, ubuntu-latest	3m 53s
Unit tests on Python 3.12, ubuntu-latest	27m 51s
Unit tests on Python 3.9, macos-latest	34m 6s
Unit tests on Python 3.12, macos-latest	43m 11s
Unit tests on Python 3.9, windows-latest	38m 45s
Unit tests on Python 3.12, windows-latest	45m 50s
	3h 42m 24s

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