Switch to ruff for linting

[zanieb]

Because it's the hot new tool and it's way faster than our existing tools.

• Removes isort/flake8/autoflake8 in favor of ruff
• Runs ruff --fix
• Manually fixes remaining ruff errors

This caught a bunch of shadowed test names resulting in missed test coverage or confusing duplication.

Note there's a minor gotcha when using --fix with ORM filters; see astral-sh/ruff#2443 (comment)

I also installed the Ruff VSCode plugin which I would recommend.

I started fixing all these E501 Line too long errors (which are mostly in documentation) but got sick of it and am not sure it improves readability or provides real value. I tried to disable the check for comments so it'd just check the code, but black will fix the code when it's too long so we don't really need to have it on at all.

On main:

❯ ruff check . --statistics
625	E501	[ ] Line too long (100 > 88 characters)
234	F841	[*] Local variable `Child` is assigned to but never used
137	F541	[*] f-string without any placeholders
 88	F401	[*] `.._internal.compatibility.test_experimental.enable_prefect_experimental_test_opt_in_setting` imported but unused
 46	E402	[ ] Module level import not at top of file
 40	E731	[*] Do not assign a `lambda` expression, use a `def`
 26	F811	[ ] Redefinition of unused `AutoEnum` from line 70
 25	E711	[*] Comparison to `None` should be `cond is None`
 19	F821	[ ] Undefined name `Any`
 13	F822	[ ] Undefined name `flow_name` in `__all__`
  9	E712	[*] Comparison to `False` should be `cond is False` or `if not cond:`
  8	F403	[ ] `from .fixtures.api import *` used; unable to detect undefined names
  8	F405	[ ] `Block` may be undefined, or defined from star imports: `.fixtures.api`, `.fixtures.client`, `.fixtures.database`, `.fixtures.docker`, `.fixtures.logging`, `.fixtures.storage`, `prefect.testing.cli`, `prefect.testing.fixtures`
  5	E722	[ ] Do not use bare `except`
  2	E713	[*] Test for membership should be `not in`
  1	E714	[*] Test for object identity should be `is not`
  1	F402	[ ] Import `call` from line 1 shadowed by loop variable
  1	F601	[ ] Dictionary key literal `"thing_one"` repeated

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