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style: Don't share styles when an element has animations applied to it.
We already avoid putting styles in the shared style cache for an element that has animations but if we are doing the initial style of two siblings where the _second_ has animations applied, there is nothing to stop us from trying to share with the first (un-animated) element. This patch adds a check to prevent sharing in that case since sharing style between animated elements is unsound for the reasons described in . A number of tests including: testing/web-platform/tests/web-animations/animation-model/animation-types/visibility.html will fail without this fix once we remove the style flush from KeyframeEffect::SetKeyframes later in this patch series.  https://searchfox.org/mozilla-central/rev/6e3cc153566f5f288ae768a2172385b8436d61dd/servo/components/style/sharing/mod.rs#597 Differential Revision: https://phabricator.services.mozilla.com/D18913
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