Upgrade media / GStreamer / GLib (#30750)

- Upgrade the version of GStreamer for Windows

This upgrades the Windows build to use the most recent version of
GStreamer. This is necessary to upgrade our GStreamer dependency.

- Stop shipping GStreamer binaries on Linux

The binary bundle of GStreamer that we package is not used to compile --
only to run layout tests. It's too old for the APIs that we are using
(as evidenced by needed 1.18 for WebRTC) and nowadays Linux
distributions carry a new version so it's unecessary for our build
machines. No longer using this binary bundle will allow us to upgrade
our GStreamer dependency -- which now has stricter checks that we
are using at least version 1.18.

- Upgrade media to use newer versions of GStreamer / GLib dependencies

python/servo/gstreamer.py

@@ -22,6 +22,7 @@ GSTREAMER_DYLIBS = [
     "gstfft",
     "gstgl",
     "gstpbutils",
+    "gstplay",
     "gstriff",
     "gstrtp",
     "gstrtsp",
@@ -33,6 +34,7 @@ GSTREAMER_DYLIBS = [
     "gstcodecparsers",
     "gstplayer",
     "gstwebrtc",
+    "gstwebrtcnice",
 ]
 
 
@@ -84,12 +86,9 @@ def windows_dlls():
 
 
 def windows_plugins():
-    # FIXME: We should support newer gstreamer versions here that replace
-    # gstvideoconvert and gstvideoscale with gstvideoconvertscale.
     libs = [
         *GSTREAMER_PLUGINS,
-        "gstvideoconvert",
-        "gstvideoscale",
+        "gstvideoconvertscale",
         "gstwasapi"
     ]
     return [f"{lib}.dll" for lib in libs]