Fix Stacked progress width transition animation #41659
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Closes #41596
This PR adds an extra CSS rule for the animation of progress stack width.
Regular progress bars animate their width property. Stacked progress bars have their progress controlled by the parent
.progress container
's width, not the individual bar's width. To fix transitions in stacked progress bars, I applied the transition to the container.There's a temporary example in the Checkout example page based on https://stackblitz.com/edit/bootstrap-5-qckpcxzb?file=src%2Findex.html to show that the fix works correctly.