Investigate crash for Text() widgets with large input

https://github.com/flutter/devtools/pull/6254 Limited the text boxes for network requests/responses since 4MB images would crash devtools.

We should check if there Text widgets really can't handle that much text at once, or if there is a deeper issue going on when displaying large text in a Text widget.

Start with PR #6254 and reproduce the network request/response case using text around 4 MB in a Text widget. Investigate whether the crash is caused by Text itself or by a deeper DevTools display issue. Done means identifying the cause and documenting the required fix or limitation.

Vom Indexierungsmodell aus dem Issue-Text verfasst.