TEST-#6932: don't use deprecated pandas._testing.makeStringIndex

[anmyachev]

What do these changes do?

Same as in https://github.com/pandas-dev/pandas/pull/56155/files.

• first commit message and PR title follow format outlined here

  NOTE: If you edit the PR title to match this format, you need to add another commit (even if it's empty) or amend your last commit for the CI job that checks the PR title to pick up the new PR title.

• passes flake8 modin/ asv_bench/benchmarks scripts/doc_checker.py
• passes black --check modin/ asv_bench/benchmarks scripts/doc_checker.py
• signed commit with git commit -s
• Resolves ASV: AttributeError: module 'pandas._testing' has no attribute 'makeStringIndex' #6932
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date

asv is still failing

[anmyachev]

asv is still failing

it's due to:

• read_parquet failed to read the dataset created by to_parquet with index = False. #6936
• Merge failed when right operand is an empty dataframe #6935

[YarShev]

I see. Will we fix all of the issues separately?

[anmyachev]

I see. Will we fix all of the issues separately?

Yes, that's the plan.