Audio sink iteration test doesn't correctly detect all sinks when multiple HDMI port are mapped under the same wpctl device ID

[tomli380576]

Bug Description

In pipewire-utils.py iter-audio-sinks, if the DUT's BIOS decides to map all HDMI/DP ports under the same audio device, this script doesn't correctly list them during iteration and is inconsistent with GNOME audio setting's behavior.

This is consistent with wpctl, so we probably need a different way of changing sinks than just wpctl set-default <ID>.

Cert-blocker Test Case

• cert-blocker

To Reproduce

1. Connect 2 HDMI/DP displays to a dock
2. Connect that dock to the DUT's USB-C port
3. python3 pipewire_utils.py iter-audio-sinks -c "speaker-test -c 2 -l 1 -t wav"

Expected Result

All sinks are listed

Actual Result

Only 1 HDMI/DP sink is listed

Environment

ubuntu 24.04

Relevant log output

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CHECKBOX-2277.

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