fix: Make UvExecutor set directory and project options on uv run

[nat-n]

fixes #281

Description of changes

Replace this text with a description of the changes proposed in this PR, including the motivation for these changes and a reference to any related GitHub issue or discussion.

Pre-merge Checklist

• Bug fixes (if any) are accompanied by a test (if not too complicated to do so)
• poe check executed successfully
• This PR targets the development branch for code changes or main if only documentation is updated

[Copilot]

Pull Request Overview

This PR updates the UvExecutor to explicitly set the working directory and project directory by appending the appropriate options when executing uv commands. It also introduces updated configuration files and tests to validate that these options are correctly passed.

• Added a subproject configuration for uv tasks.
• Introduced a new test to validate working directory handling.
• Updated the UvExecutor and base executor to resolve and use the working directory and project options.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/fixtures/uv_project/subproject/pyproject.toml	Provides configuration for a uv subproject with the new uv-specific tool settings.
tests/test_uv_executor.py	Adds a test to verify that the working directory and environment variables are correctly passed to uv tasks.
tests/fixtures/uv_project/pyproject.toml	Updates the uv project configuration, including transforming the show-env task definition.
poethepoet/executor/uv.py	Updates UvExecutor to append --directory and --project options based on resolved working directory and configuration.
pyproject.toml	Adds .ruff_cache to the list of paths to be removed from generated files.
poethepoet/executor/base.py	Resolves the working directory to an absolute path to ensure correctness in directory handling.