tests: attempt at fixing tests

[ErikBjare]

[!IMPORTANT] Fix test reliability and timeout issues in tests/test_mcp.py, adjust timeouts in gptme/mcp/client.py, and update build.yml to install uv.

• Tests:
  • Mark test_sqlite_connection, test_sqlite_operations, test_memory_connection, and test_memory_operations in tests/test_mcp.py with @pytest.mark.xfail due to CI timeouts.
  • Adjust test_config_path to prefer uvx over pipx if available.
  • Change repository URL in test_config_path to use HTTPS.
• Client:
  • Increase timeout for initialize() to 10 seconds and list_tools() to 30 seconds in _setup_connection() in gptme/mcp/client.py.
• Workflow:
  • Update build.yml to install uv with poetry.

^{This description was created by for 518c01819396b0c07487d3ceff287bfcd248bec6. It will automatically update as commits are pushed.}

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests.

:loudspeaker: Thoughts on this report? Let us know!

[ErikBjare]

Not sure why this was needed anymore. The existing tests seem to work fine?