fix(pointer): make sure to check all fields of `coords` in `isDifferentPointerPosition()`

[bawjensen]

What:

Fixing a bug I observed where I tried to simulate click-and-drag, and the second event didn't fire because the logic thought the two positions were equal.

Why:

Fixes #1139.

How:

Checked https://github.com/bawjensen/user-event/blob/d0362796a33c2d39713998f82ae309020c37b385/src/event/types.ts#L27-L38, and used all those fields in comparison rather than simply x and y.

Checklist:

• N/A Documentation
• [x] Tests
• [x] Ready to be merged

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:tada: This PR is included in version 14.6.0 :tada:

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