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test(vsock): add a fixture for the uds-vsock tests

Every test repeated the same ~35 lines to set up guest memory, the
queues, the device and the worker, and then open-coded the interrupt,
descriptor and connection handshake steps.

Add a VsockTest fixture that owns the running worker, the queues and the
host socket path, with helpers for the recurring steps: offering RX
descriptors, waiting for RX messages, sending TX messages, connecting a
host client and completing the CONNECT handshake. Move the device
metadata assertions of vsock_conn_test into a separate vsock_dev_test,
as they need no worker.

No change in coverage, the file shrinks from 977 to 571 lines.

Assisted-by: Antigravity:Claude-Opus-5
Signed-off-by: Changyuan Lyu <changyuanl@google.com>

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