TST: Remove duplicate invalid sheet tests from io.excel
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them

Followup from #39482 - removed tests are duplicates of `test_readers.test_bad_sheetname_raises`

thanks @rhshadrach 