[core] Remove `delayType` prop across hoverable popup components

[atomiks]

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

Closes #654. Now all hoverable popups only open once the cursor is at "rest". As before with rest, they can never open when scrolling and the cursor happens to land on a trigger, since mousemove isn't triggered in that case.

• @floating-ui/[email protected] will ignore insignficant movements for restMs once it's released (allows small 1px movements to handle tremors that are also considered to be "at rest"), but is not tied to this PR.

[mui-bot]

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