FIX-#6946: Remove 'needs: [lint-black-isort, ...]'

[dchigarev]

What do these changes do?

The lint-black-isort was moved to another file (#6945), so referencing it is no longer valid

• 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 Remove needs: [lint-black-isort, ...] #6946
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date

[dchigarev]

jobs from ci-required.yml are not technically required to run jobs from ci.yml, so this PR actually changes the ci's flow, allowing for the jobs to be run even if lint-black-isort haven't passed successful (hope it's not a problem, or anyone have a solution for this?)

[dchigarev]

cc @anmyachev

[anmyachev]

We could only move isort to another ci flow, and leave black here. The only reason to leave black is it can find syntax errors and return an error sooner. However I don't mind trying the current solution.

[dchigarev]

flake8 can also find syntax errors, so let's leave it as it is

[anmyachev]

ok