[Discover] Fix flaky cell actions tests

[davismcphee]

Summary

This PR (hopefully) fixes some tricky cell actions functional tests related to default Discover profile state. I still haven't been able to reproduce it locally, but I have a suspicion about where the race condition is.

Resolves #193367.
Resolves #193400.

Checklist

• 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
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This was checked for breaking HTTP API changes, and any breaking changes have been approved by the breaking-change committee. The release_note:breaking label should be applied in these situations.
• Flaky Test Runner was used on any tests changed
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines

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