After WPT has access to other node properties, verify non-standard `coltext`/`rowtext` doesn't conflict with the standard `colindextext`/`rowindextext`

[cookiecrook]

After WPT has access to other node properties, verify non-standard coltext/rowtext doesn't conflict with the standard colindextext/rowindextext

@joanmarie mentioned here that it [Orca? UA?] does a check because Google Sheets uses the wrong one.
w3c/aria#2361 (comment)