[useAnchorPositioning] Disable auto axis flipping

[x] I have followed (at least) the PR section of the contributing guide.

Based on https://github.com/mui/base-ui/pull/810, auto side axis-based flipping should be off by default.

Changing the algorithm in Floating UI will probably require considerable effort/time to resolve in a way that works in most situations (for instance, the alignment chosen seems incorrect based on the preferred side).

For now this is a good enough default to use as other libraries use this.

Two workarounds exist to this prop:

--available-width can be used to ensure left/right side popups don't overflow on narrow screens while preserving the preferred side axis.
A manual JavaScript media query based on the viewport width can be used to conditionally pass in a different preferred side.

mui / base-ui

[useAnchorPositioning] Disable auto axis flipping #817

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