Fix ZHA network formation

[puddly]

Proposed change

Zigpy now sets the TX power itself based on the passed through HA country. This PR fixes unit tests to use less mocks (which masked the issue) and reverts #155855, since it is no longer necessary.

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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (homeassistant_connect_zbt2) you are listed as a code owner for? Thanks!

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[home-assistant]

Hey there @dmulcahey, @Adminiuga, @TheJulianJES, mind taking a look at this pull request as it has been labeled with an integration (zha) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This PR fixes ZHA network formation by removing manual TX power configuration, as zigpy now handles TX power internally based on the Home Assistant country setting. It reverts PR #155855 which previously added TX power configuration logic.

Key changes:

• Removed config parameter from async_form_network() method since TX power is now handled by zigpy
• Eliminated TX power constants and country-to-power mapping from homeassistant_connect_zbt2
• Improved test mocking to use create_autospec instead of generic AsyncMock for better type safety

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/components/zha/test_config_flow.py	Enhanced mock to use create_autospec(ControllerApplication) for more accurate testing
tests/components/homeassistant_connect_zbt2/test_config_flow.py	Removed parametrized TX power tests and assertions
homeassistant/components/zha/radio_manager.py	Removed config parameter from async_form_network() method
homeassistant/components/zha/config_flow.py	Removed _extra_network_config instance variable and TX power handling logic
homeassistant/components/homeassistant_hardware/firmware_config_flow.py	Removed _extra_zha_hardware_options() method that provided TX power
homeassistant/components/homeassistant_connect_zbt2/const.py	Removed TX power constants and country mapping dictionary
homeassistant/components/homeassistant_connect_zbt2/config_flow.py	Removed _extra_zha_hardware_options() override that calculated TX power from country

[TheJulianJES]

Nice! Looks good.

• Tested new network formation with ZBT-2 and a third-party adapter: it works correctly again
• Revert for the ZBT-2 integration specific TX power changes is also good, since the firmware that includes the country <> TX power mapping is already released as a stable version, so everyone will get that before setting up ZHA.
• The test change is also a nice improvement.