[Bug]: Grid component performance issues

### What happened?

@kunalpanchal mentioned:

- OOM issues
- Grid not loading or virtualizing dom elements
- Copy doesn't work always, Try selecting multiple columns/rows
- There is no outline *1 around them indicating what cells are selected

Team created concurrent "Grid2"

*1 - @crisalbu @elizabetdev @DreaminDani

cc @gjones

### Component(s) affected

Grid

### How to reproduce

- There are "stories" in the clone version. Attempt to copy it locally to replicate issues.
- Find pr 22723

### Click UI Version

0.250.0

### Browser(s)

Other

### Operating system

Did not inform

### Is this a regression?

Not sure

### Last working version (if regression)

Did not inform

### Screenshots or recording

Did not provide

### Visual / UX checklist

- [ ] Checked in both light and dark mode (if applicable)
- [ ] Checked at different viewport sizes (if applicable)
- [ ] Checked with keyboard navigation (if applicable)
- [ ] Checked for visual regressions in related components

Start with the Grid stories in the clone version and inspect PR 22723 for the relevant implementation context. Reproduce the reported OOM, loading or virtualization, copy, and multi-selection outline problems. Done means the Grid loads and virtualizes correctly, copy works reliably, and selected cells have a visible outline without the reported memory issue.

Written by the indexing model from the issue text.