Summary

Fixes: #65949

Actually I wouldn't call it a "fix" but more of a work-around. Screenshots from intermittent failures on removing sample data show the "Remove" button as if it had not been clicked but the logs indicate that it found and clicked it.

My theory is that 2 checks have to happen when the sample data page loads, for each set of sample data;

1. check if it's installed or not
2. check if the logged in user has the privileges to add or remove the data

I don't know the order that those checks happen in (and maybe other checks) vs when the "Remove" button is rendered, but there could be a small timing window where the button is visible and enabled but actually won't remove the same data.
This PR attempts to test that case by adding about a 1 second sleep (I use 1010ms to make it easier to find something that might be unique in the logs) between the time we find the button is enabled and when we click it.

Alternatively we could change the removeSampleDataSet to retry clicking the button until we find it changed to disabled. But that feels worse to me, as far as masking a potential code bug, then adding a small delay before a single try.

Checklist

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• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
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• This was checked for cross-browser compatibility

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• This was checked for breaking API changes and was labeled appropriately