Fixes #23552 - add keys to table and fix select row formatters

[tstrachota]

• Replaces patternfly-react custom formatters with our selection formatters in the upstream subscription table
• Renames selectionFormatter to more obvious selectionHeaderCellFormatter
• Removes {props: {index}} from column definitions (they're no longer needed)
• Fixes Warning: Each child in an array or iterator should have a unique "key" prop.

[theforeman-bot]

Issues: #23552

[waldenraines]

Code looks good, nice changes. Did some regression testing and couldn't find any issues with these changes.

Thanks @tstrachota!