fix(overflowmenu): improve autoAlign fallback placements

[tay1orjones]

Based on a slack conversation, this improves the fallback placements for OverflowMenu's autoAlign. Here's an example of the problem:

2024-08-22.at.12.46.01-MAIN-Google.Chrome.mp4

With this PR it avoids vertically flipping unless it absolutely has to:

2024-08-22.at.12.48.36-MAIN-Google.Chrome.mp4

Changelog

New

• reorder the fallbackPlacements based on the value of menuAlignment

Changed

• updated/improved code comments

Removed

• removed fallbackAxisSideDirection because it's ignored when fallbackPlacements is used

Testing / Reviewing

• Check out the feature flagg overflow auto align story, ensure it works in a more logical way to what you'd expect as shown in the video.

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[emyarod]

looks good to me!