build: configure ruff from pyproject.toml (#1100)

# What does this PR do?

- Remove hardcoded configurations from pre-commit.
- Allow configuration to be set via pyproject.toml.
- Merge .ruff.toml settings into pyproject.toml.
- Ensure the linter and formatter use the defined configuration instead
of being overridden by pre-commit.

Signed-off-by: Sébastien Han <seb@redhat.com>

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
[Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.*]

[//]: # (## Documentation)

Signed-off-by: Sébastien Han <seb@redhat.com>

llama_stack/providers/inline/tool_runtime/code_interpreter/code_env_prefix.py

@@ -83,12 +83,6 @@ import sys as _sys
 from contextlib import (  # noqa
     contextmanager as _contextmanager,
 )
-from contextlib import (
-    redirect_stderr as _redirect_stderr,
-)
-from contextlib import (
-    redirect_stdout as _redirect_stdout,
-)
 from multiprocessing.connection import Connection as _Connection
 
 # Mangle imports to avoid polluting model execution namespace.