[EuiDataGrid] Use displayAsText for column sort search and columns headers

[j-m]

Summary

• Datagrids now use displayAsText column prop as a heading ([EuiDataGrid] displayAsText not setting column names #4114). Will use display over displayAsText, and displayAsText over id.
• Column search now compares input against the displayAsText column prop ([EuiDataGrid] Columns search does not match display text #4204). Will still use id if displayAsText was not provided.

Before

After

Checklist

Other than changelog, I don't think any of these apply; I thought I'd wait for a review before editting the changelog. Should I add a test or two?

• Check against all themes for compatibility in both light and dark modes
• Checked in mobile
• Checked in Chrome, Safari, Edge, and Firefox
• Props have proper autodocs
• Added documentation
• Checked Code Sandbox works for the any docs examples
• Added or updated jest tests
• Checked for breaking changes and labeled appropriately
• Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately

[kibanamachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[cla-checker-service]

💚 CLA has been signed

[j-m]

Regarding the CLA, I did this in my free time but in future I may contribute during work hours with this account. I shall sign the individual contributor agreement for now, as work may want me to use a different account anyway, but it may be worth adding an email field alongside the github username.

[snide]

jenkins test this

[snide]

@j-m Thanks for the PR. A quick glance and your changes look good. You'll want to add a changelog for this. Here's a suggestion.

- Changed `EuiDataGrid` to display and search against `displayAsText` in the columns popover when provided instead of `id`  `EuiTreeViewNode` ([#4351](https://github.com/elastic/eui/pull/4351))

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_4351/

[snide]

Thanks for the PR!

[j-m]

Wow that was quick, you're very welcome!