Revert "Reland "Animate side panel opening and closing.""

This reverts commit f53300a6.

Reason for revert:
LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/5658641195597824

Sample build with failed test: https://ci.chromium.org/b/8751715654589727745
Affected test(s):
[ninja://chrome/test:interactive_ui_tests/PriceInsightsIconViewInteractiveTest.SidePanelShownOnPress](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fchrome%2Ftest:interactive_ui_tests%2FPriceInsightsIconViewInteractiveTest.SidePanelShownOnPress?q=VHash%3Ab13444d719a560a0)

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F5658641195597824&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F5415398&type=BUG

Original change's description:
> Reland "Animate side panel opening and closing."
>
> This is a reland of commit 7b94b89e
>
> See patchset 1 vs 2 for the change. The waiter for the extension's
> container side panel close button only monitored the button visibility
> when it should have been monitoring the container's visibility as well.
>
> Original change's description:
> > Animate side panel opening and closing.
> >
> > Create an animation that slides the side panel out from the side of the
> > browser. This updates the side panel and side panel coordinator to use
> > an enum, SidePanelContentState, to convey when a view should be hidden
> > and allow us to delay hiding it until the side panel has been closed.
> >
> > Bug: 328295071
> > Change-Id: I40b099a1a3d0469ba815caf152fb0ecc3562af2f
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5406892


> > Commit-Queue: Caroline Rising <corising@chromium.org>
> > Reviewed-by: David Pennington <dpenning@chromium.org>
> > Reviewed-by: Eshwar Stalin <estalin@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1280923}
>
> Bug: 328295071
> Change-Id: I64ecc52f74ade357ad8543cce98ff6daa4949c2a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5415398


> Auto-Submit: Caroline Rising <corising@chromium.org>
> Reviewed-by: David Pennington <dpenning@chromium.org>
> Reviewed-by: Eshwar Stalin <estalin@chromium.org>
> Commit-Queue: David Pennington <dpenning@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1281605}
>

Bug: 328295071
Change-Id: I136731902de4ab4890ebbc21ff918e4927f65075
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5416687


Commit-Queue: Munira Tursunova <moonira@google.com>
Owners-Override: Munira Tursunova <moonira@google.com>
Reviewed-by: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1281717}