Add nfc-ethernet DUT pairing mode for python_testing suites

[rquidute]

Summary

Adds nfc-ethernet as a valid DUT pairing mode for python_testing (SDK) tests only, so the Test Harness can commission Matter-over-Ethernet devices via NFC.

Background

• Upstream connectedhomeip PR project-chip/connectedhomeip#43613 (adds nfc-ethernet to chip-tool) is still open, so YAML/chip-tool-based tests can't use this mode yet.
• The companion PR project-chip/connectedhomeip#43657 ("Add nfc-ethernet in Python controller") is merged and present in our connectedhomeip submodule, so python_testing (SDK) tests can already accept nfc-ethernet as a --commissioning-method — this PR just exposes/maps it in the TH's config/dispatch layer.

Changes

• app/constants/shared_constants.py: added NFC_ETHERNET = "nfc-ethernet" to DutPairingModeEnum and to NFC_PAIRING_MODES.
• generate_command_arguments() in python_testing/models/utils.py needed no code change: nfc-ethernet isn't part of the wifi/thread pairing-mode tuples, so it falls straight through to the existing NFC handling that suppresses --discriminator/--passcode and injects NFC_Reader_index.
• test_suite.py OTBR setup needed no change: nfc-ethernet is not in the BLE_THREAD/NFC_THREAD/THREAD_MESHCOP tuple that triggers OTBR startup.
• Added test coverage mirroring existing nfc-wifi/nfc-thread tests:
  • test_collections/matter/sdk_tests/support/tests/python_tests/test_utils.py
  • test_collections/matter/sdk_tests/support/tests/matter/test_test_environment_config.py

Out of scope

• YAML/chip-tool test support — blocked on upstream connectedhomeip#43613, which is still under review.

Related: project-chip/certification-tool#1067

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• app/constants/shared_constants.py
• test_collections/matter/sdk_tests/support/tests/matter/test_test_environment_config.py
• test_collections/matter/sdk_tests/support/tests/python_tests/test_utils.py

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📝 Walkthrough

Walkthrough

The change adds DutPairingModeEnum.NFC_ETHERNET with the value nfc-ethernet and includes it in NFC_PAIRING_MODES. Configuration tests now cover NFC Ethernet with and without discriminator or setup code. Utility tests verify NFC-Ethernet command generation, including the commissioning method, NFC reader index, shared parameters, and omitted network and commissioning credentials.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely identifies the addition of the nfc-ethernet DUT pairing mode for Python testing suites.
Description check	✅ Passed	The description directly explains the nfc-ethernet pairing-mode change, its scope, related tests, and excluded YAML support.

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[rquidute]

@coderabbitai review full

[coderabbitai]

@rquidute I will review all changes in PR #351.

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