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[red-knot] Enforce specifying paths for mdtest code blocks in a separate preceding line (#15890)

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## Summary

Resolves #15695, rework of #15704.

This change modifies the Mdtests framework so that:

* Paths must now be specified in a separate preceding line:

	`````markdown
	`a.py`:

	```py
	x = 1
	```
	`````

If the path of a file conflicts with its `lang`, an error will be
thrown.

* Configs are no longer accepted. The pattern still take them into
account, however, to avoid "Unterminated code block" errors.
* Unnamed files are now assigned unique, `lang`-respecting paths
automatically.

Additionally, all legacy usages have been updated.

## Test Plan

Unit tests and Markdown tests.

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
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crates/red_knot_python_semantic/resources/mdtest/metaclass.md
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@ -205,7 +205,7 @@ reveal_type(D.__class__) # revealed: Literal[SignatureMismatch]
Retrieving the metaclass of a cyclically defined class should not cause an infinite loop.
```py path=a.pyi
```pyi
class A(B): ... # error: [cyclic-class-definition]
class B(C): ... # error: [cyclic-class-definition]
class C(A): ... # error: [cyclic-class-definition]