chore: flaky test fixes

[joelamb]

await requestAnimationFrameSettled() before checking column width values in the DOM

some resizing tests were a bit flaky not returning the expected column widths. eg. on resetting four columns in a 1000px container the test would sometimes return the col widths as 128px (the min) rather than the expected (250px - 1/4 of the overall container width). I suspect that this is due to the test checking before the full reset and new width calculation was complete and the table fully rendered and settled.

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