Carousel fixes

This PR fixes a few carousel issues.

• Ensures carousel works in IE10 and IE11 by removing the transform3d detection mixin entirely as all our supported browsers support it. There was no fallback being provided, so IE10/11 were left in the dark as we were keying off -webkit detection. Fixes #22198 (closed).

• Fixes the image aspect ratio issues. Also moved from .img-fluid to .w-100 in our examples. Pulls in @vanduynslagerp's fix from #21799. Fixes #21658 (closed), fixes #21966 (closed), closes #21799.

• Changes the timing function from ease-in-out to ease to fix the "bouncing" into place when carousel items move. This kinda sucks, but there's no other CSS change I can see us making to fix this issue. Fixes #21685 (closed), fixes #21751 (closed), fixes #22291 (closed).