Add integration tests for SSH Command using pytest-homeassistant-custom-component

[Copilot]

Adds real Home Assistant integration tests (using pytest-homeassistant-custom-component) mirroring the pattern from task_tracker PR #21, and relocates unit tests from test/ to tests/unit_tests/.

Test structure

• tests/unit_tests/ — existing unit tests (moved from test/; path depth updated from parent×3 → parent×4)
• tests/integration_tests/conftest.py — creates custom_components/ssh_command → <repo_root> symlink at test collection time so HA's loader discovers the component; provides auto_enable_custom_integrations fixture
• tests/integration_tests/test_integration.py — 29 tests against a live in-process HomeAssistant instance, with only asyncssh patched out

Integration test coverage

Class	What's tested
TestSetupEntry	Coordinator in hass.data, service registered, single-instance guard
TestUnloadEntry	Coordinator removed on unload
TestConfigFlow	Entry created, second attempt aborted
TestExecuteServiceSuccess	stdout/stderr/exit_status, password & key-file auth, inline & file input, custom timeout
TestExecuteServiceKnownHosts	check_known_hosts=False → None, custom/missing file, default ~/.ssh/known_hosts
TestExecuteServiceValidation	All 5 _validate_service_data error paths, including no coordinator present
TestExecuteServiceErrors	All SSH exception types (HostKeyNotVerifiable, PermissionDenied, TimeoutError, gaierror, generic OSError)

Infra changes

• requirements_integration_tests.txt — pytest-homeassistant-custom-component==0.13.318
• pytest.ini — asyncio_mode = auto
• .github/workflows/integration-tests.yml — new CI job running pytest tests/integration_tests/ -v
• test.yml updated to discover -s tests/unit_tests
• pylint.yml ignore-paths updated to ^tests/.*$
• run_tests.sh updated to tests/unit_tests
• .gitignore excludes custom_components/ (created at runtime by conftest.py)

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