[EuiDataGrid] Allow isExpandable to be set via setCellProps

[cee-chen]

Summary

closes #2793

This PR allows isExpandable to be set at the cellProps level, which lets consumers override/more granularly set column.isExpandable. Consumers can key off of any of the props passed to renderCellValue, such as rowIndex, colIndex, columnId, schema, etc.

QA

https://eui.elastic.co/pr_5667/#/tabular-content/data-grid-cell-popovers#disabling-cell-expansion-popovers

Checklist

- [ ] Check against all themes for compatibility in both light and dark modes
- [ ] Checked for accessibility including keyboard-only and screenreader modes
- [ ] Checked in mobile
- [ ] Checked in Chrome, Safari, Edge, and Firefox
- [ ] Props have proper autodocs and playground toggles
- [ ] Checked Code Sandbox works for any docs examples

• Added documentation
• Added or updated jest and cypress tests

- [ ] Checked for breaking changes and labeled appropriately

• A changelog entry exists and is marked appropriately

[cee-chen]

@chandlerprall 👋 Opening this PR mostly to get your thoughts on this. This PR fully works and solves the use-case that users are requesting in #2793, I just had a few questions for you first:

• Is this a good idea? Do we want to expand setCellProps to non-DOM-only props / props used by the internal EuiDataGridcell?
• Or would it be better to follow Chris's suggestion of converting column.isExpandable to accept a fn that returns a boolean instead, so we don't muddy the waters of setCellProps being DOM-only attributes?
• Do we need a specific documentation example for this, or is this straightforward enough as-is?

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5667/

[chandlerprall]

One bit of logic was inverted, but the rest LGTM

[chandlerprall]

Do we need a specific documentation example for this, or is this straightforward enough as-is?

Let's include it on the Data grid cell popovers page

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5667/

[chandlerprall]

I pushed up a missing useEffect import for the example, but everything else LGTM. I played with the datagrid focus example, verifying overriding from false->true also works and that the various focus states all respect overrides.

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5667/

[cee-chen]

Whoops, I totally forgot to stage that line 🤦‍♀️ (was working ahead to the cell actions branch and getting my staging all dirty). Thanks a million for the catch!

Super fortuitously, the new cell actions logic for #5132 (the part where I need to check if cellActions exists and override isExpandable if so) will be able to hook into the new this.isExpandable() method 🎉

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5667/