test: add tests dbus notification images (#43946)

* test: add tests dbus notification images

Provide a NativeImage icon in the notification tests and then inspect
the DBus message payload's `image_data` hint to see if it's correct.
This adds test coverage for LibnotifyNotification::Show() and for
GdkPixbufFromSkBitmap().

Co-authored-by: Charles Kerr <charles@charleskerr.com>

* chore: use the same notification_icon.png as in main

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Charles Kerr <charles@charleskerr.com>
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trop[bot] 2024-09-25 16:48:24 -05:00 committed by GitHub
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