Update opening device position from status requests

[mnaggatz]

Fixes #679

During live testing with a courtyard gate, a garage door and Somfy roller shutters, these opening devices could remain unknown for a long time after a Home Assistant restart.

The heartbeat already sends status requests for all nodes when heartbeat_load_all_states=True, but NodeUpdater.process_frame_status_request_notification() only applied position data from GW_STATUS_REQUEST_NTF for Blind and DualRollerShutter. Other OpeningDevice types such as Gate, GarageDoor and RollerShutter ignored the main parameter (MP, NodeParameter(0)) from the status request response.

This updates generic OpeningDevice instances from concrete status request MP values, while still ignoring unavailable values such as UNKNOWN / IGNORE. The specialized handling for Blind and DualRollerShutter is unchanged.

Added regression tests for:

• Gate recovering from UNKNOWN via status request MP data
• GarageDoor recovering from UNKNOWN via status request MP data
• unavailable status request values not replacing an existing concrete position

[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/pyvlx
node_updater.py
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