Splitter: Incorrect detection of nested SplitterPanel

[usrlocl]

Describe the bug

Current logic incorrectly identifies any nested Prime Component (such as a Button) as a nested SplitterPanel causing incorrect behaviour and messes up styles. This change fixes that to identify SplitterPanel component only for such purpose.

Reproducer

https://stackblitz.com/edit/stackblitz-starters-kshvdxcw?file=src%2FApp.tsx

System Information

primereact: 10.9.7
react: 18.3.1

Steps to reproduce the behavior

stackblitz link shared above

Expected behavior

In the stackblitz example, Button should render with default styling

[melloware]

@usrlocl do you think this one is related? #8432

[usrlocl]

Shouldn't be. This one is very specific to containing a nested Prime Component. The resize issue seems to happen even otherwise.