[Unified Data Table] Split test into 3 smaller tests

[AlexGPlay]

Summary

Closes #234829

Right now we have the should show the reset width button only for absolute width columns, and allow resetting to default width test that is asserting 3 different things:

• When resetting the width of the time column from absolute it goes back to the default
• When resetting the width of a column that isn't the time column from absolute it goes back to the default
• A column without absolute width can't be reset

This means that we can split the test into 3 smaller and more focused tests for each of those scenarios. This should help with the timeout as we are no longer waiting for a big one.

Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

• Unit or functional tests were updated or added to match the most common scenarios
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines
• Review the backport guidelines and apply applicable backport:* labels.

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 26798fb

Failed CI Steps

• FTR Configs #71

Metrics [docs]

✅ unchanged

cc @AlexGPlay

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[NicholasPeretti]

Nice refactor! Thank you for this ☺️ 🚀

[jughosta]

LGTM, thanks!

[jughosta]

Let's backport to 9.2 as it fails sometimes there too.