[Tests][NNAPI] Skip tests cleanly when remote environment is unavailable

[tlopex]

The remote() helper in tests/python/nightly/test_nnapi/conftest.py returned None when TVM_TRACKER_HOST, TVM_TRACKER_PORT, or RPC_DEVICE_KEY was not set, causing every caller doing remote_obj, tracker = remote() to fail with
TypeError: cannot unpack non-iterable NoneType object.

Call pytest.skip() with the list of missing environment variables instead, so the 30 tests in test_ops.py (and test_network.py) report as skipped rather than failed when no NNAPI remote device is configured. Behavior with a configured remote is unchanged.

[gemini-code-assist]

Code Review

This pull request refactors the remote function in tests/python/nightly/test_nnapi/conftest.py to explicitly skip tests using pytest.skip when required environment variables are missing, rather than returning None. Feedback suggests renaming the local variable remote to avoid shadowing the function name, which would improve code readability and maintainability.

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[gemini-code-assist]

The local variable remote shadows the function name remote(). While Python allows this, it can be confusing and makes the code harder to maintain. Renaming the local variable to remote_session or session would improve readability and avoid shadowing.

Suggested change

	remote = tracker.request(rpc_device_key, priority=0, session_timeout=600)
	return remote, tracker
	remote_session = tracker.request(rpc_device_key, priority=0, session_timeout=600)
	return remote_session, tracker