[EuiDataGrid] Remove pointer-events: none on header actions

[mgadewoll]

Summary

This PR is a follow-up to #9166

It removes the previously added pointer-events: none, as this can interfere with tests that try to click the button element during transition.

Note

The tests on the original PR succeeded but tests on main after merge failed. 🤷‍♀️

Additionally the test increases and unifies the wait time before clicking the action button in draggable_columns.spec.tsx to ensure the button has had enough time to transition.

Why are we making this change?

🩹 Test robustness: Prevent flaky tests.

Screenshots #

Impact to users

🟢 Test related change only.

QA

• CI passed
• verify tests pass locally

General checklist

• Browser QA
  • Checked in both light and dark modes
  • Checked in both MacOS and Windows high contrast modes
    • (emulate forced colors if you do not have access to a Windows machine.)
  • Checked in mobile
  • Checked in Chrome, Safari, Edge, and Firefox
  • Checked for accessibility including keyboard-only and screenreader modes
• Docs site QA
  • Added documentation
  • Props have proper autodocs (using @default if default values are missing) and playground toggles
  • Checked Code Sandbox works for any docs examples
• Code quality checklist
  • Added or updated jest and cypress tests
  • Updated visual regression tests
• Release checklist
  • A changelog entry exists and is marked appropriately
  • If applicable, added the breaking change issue label (and filled out the breaking change checklist)
  • If the changes unblock an issue in a different repo, smoke tested carefully (see Testing EUI features in Kibana ahead of time)
• Designer checklist
  • If applicable, file an issue to update EUI's Figma library with any corresponding UI changes. (This is an internal repo, if you are external to Elastic, ask a maintainer to submit this request)

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 6f1253b
• Documentation website
• Storybook

cc @mgadewoll

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 6f1253b

cc @mgadewoll

[tkajtoch]

Changes look good