chore(tooling): unify eels & eest ruff experience

[danceratopz]

End Goal

Enable two command-lines that lint, respectively check source formatting, across the entire post-weld codebase:

# lint (flake8)
ruff check --no-fix --show-fixes src tests
# format (black)
ruff format --check src tests

Status Quo

• EELS and EEST use different ruff rules.
• EELS doesn't use ruff format.
• EELS doesn't lint/format ./tests.
• EEST needs to reformat 99 -> 79.

Sub-tasks

Pre-Switch

• BOTH: chore(tooling): agree on common post-weld ruff rules #1403
• EELS: chore(tooling): add missing code formatting checks (ruff format --check) #1397
• EELS: Enable ruff on all source under tests.
• EEST: Consider fixing comment and docstring lines(<79) in EEST to enable a faster/smoother Switch.

At Switch

After EEST freeze & sub-tree update; PR in EELS:

• Re-format EEST code w/79.
• Update tox.ini to unify ruff commands.

[marioevz]

I think we should split this into two different issues, pre and post switch @danceratopz .