uriplaylistbin: All tests broken by decodebin3 fixes

Fix in question: gstreamer!7401 (merged) (CC @bilboed)

The tests are all failing now like: (probably broken expectations in the test)

     Running tests/uriplaylistbin.rs (/gst-plugin-rs/target/debug/deps/uriplaylistbin-748c95e3a750a421)

running 1 test

(uriplaylistbin-748c95e3a750a421:3818133): GStreamer-CRITICAL **: 09:13:19.613: 
Trying to dispose element fakesink1, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.


(uriplaylistbin-748c95e3a750a421:3818133): GStreamer-CRITICAL **: 09:13:19.613: 
Trying to dispose element fakesink0, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.


(uriplaylistbin-748c95e3a750a421:3818133): GStreamer-CRITICAL **: 09:13:19.614: 
Trying to dispose element uriplaylistbin0, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.


(uriplaylistbin-748c95e3a750a421:3818133): GStreamer-CRITICAL **: 09:13:19.615: 
Trying to dispose element multiqueue1, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.


(uriplaylistbin-748c95e3a750a421:3818133): GStreamer-CRITICAL **: 09:13:19.615: 
Trying to dispose element decodebin3-0, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.


(uriplaylistbin-748c95e3a750a421:3818133): GStreamer-CRITICAL **: 09:13:19.615: 
Trying to dispose element playlist-uridecodebin, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.


(uriplaylistbin-748c95e3a750a421:3818133): GStreamer-CRITICAL **: 09:13:19.615: 
Trying to dispose element playlist-streamsynchronizer, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.


(uriplaylistbin-748c95e3a750a421:3818133): GStreamer-CRITICAL **: 09:13:19.615: 
Trying to dispose element pipeline0, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.

test multi_audio_video ... FAILED

failures:

---- multi_audio_video stdout ----
thread 'multi_audio_video' panicked at utils/uriplaylistbin/tests/uriplaylistbin.rs:253:13:
message is not a stream collection
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

CC @gdesmott