Fix FPM UDS test for very long name check by extending its length

It did not correctly produce error message if run in in a short src path

Warn when fpm socket was not registered on the expected path

This might happen if the UDS length limit is exceeded.

Co-authored-by: Jakub Zelenka <bukka@php.net>

Closes GH-

Warn when fpm socket was not registered on the expected path

This might happen if the UDS length limit is exceeded.

Co-authored-by: Jakub Zelenka <bukka@php.net>

Closes GH-11066

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