RFR: 8296330: Tests: Add layout container snapping tests

Fri Nov 4 20:00:33 UTC 2022

On Thu, 3 Nov 2022 21:15:08 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

> While checking https://bugs.openjdk.org/browse/JDK-8295078 I found much more layout container which do not snap their children correctly.
> 
> The goal of this PR is to add snapping tests for all layout container.
> After that we can create issues for all broken layout container, fix them and comment in the corresponding line.

NOTE: this is blocked by the fix for [JDK-8296283](https://bugs.openjdk.org/browse/JDK-8296283), which @arapte plans to do next week.

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PR: https://git.openjdk.org/jfx/pull/936