Animation: update image active frame when update the rendering (#36286)

When no CSS animation exist, register timer for image animation, update
animated image active image frame as part of update_the_rendering, mark
node as dirty if the corresponding image need update. Added unit test to
test ImageAnimationState.

Part of https://github.com/servo/servo/issues/36057, the last step to
let the Animated Image "Move".

Testing: Introduced new WPT RefTest for animated image, but fail because
of https://github.com/servo/servo/issues/36931. New unit test for
`ImageAnimationState`.
Fixes: https://github.com/servo/servo/issues/22903
https://github.com/servo/servo/issues/36057

[Try](https://github.com/rayguo17/servo/actions/runs/14724729664)

---------

Signed-off-by: rayguo17 <rayguo17@gmail.com>

python/servo/testing_commands.py

@@ -175,6 +175,7 @@ class MachCommands(CommandBase):
             "net",
             "net_traits",
             "pixels",
+            "script_layout_interface",
             "script_traits",
             "selectors",
             "servo_config",