REFACTOR-#6812: Remove 'PyarrowOnRay' execution in favour of pyarrow-backed pandas dataframes

[anmyachev]

What do these changes do?

• 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 Consider to remove experimental PyarrowOnRay execution #6812
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date

[YarShev]

There are references to pyarrow.gandiva in the code in doc_checker and docs/conf.py. Should we remove it too?

[anmyachev]

There are references to pyarrow.gandiva in the code in doc_checker and docs/conf.py. Should we remove it too?

I removed it, except for troubleshooting section, since users can still use pyarrow.gandiva with Modin on HDK.