Add integration tests for tools

[codegen-sh]

This PR adds integration tests for various tools in the codebase, addressing the requirements in CG-11038.

Changes

• Added test_workspace_tools.py with tests for:

  • view_file
  • list_directory
  • create_file
  • edit_file
  • delete_file
  • rename_file
  • search
  • replacement_edit

• Added test_slack.py with tests for:

  • add_links_to_message
  • send_slack_message

• Added test_reflection.py with tests for:

  • perform_reflection

• Added test_relace_edit.py with tests for:

  • relace_edit with real API (skipped if API key not available)
  • relace_edit with mocked API
  • relace_edit error handling

Testing

The tests can be run with pytest:

pytest tests/integration/extension/test_workspace_tools.py
pytest tests/integration/extension/test_slack.py
pytest tests/integration/extension/test_reflection.py
pytest tests/integration/extension/test_relace_edit.py

Some tests require environment variables to be set:

• test_relace_edit.py requires RELACE_API to be set for the real API test (otherwise it's skipped)

These tests complement the existing integration tests for Linear, GitHub, and Bash tools.

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