wget2 | Add a test for long filename handling (#610)

[@rockdaboot]

Tim Rühsen created an issue: https://gitlab.com/gnuwget/wget2/-/issues/610



>From IRC/matrix:
```
Hi! wget seems to have a bug. When downloading a file with a 240char long 
filename it renames the file to a 236char long one and drops the extension. 
This is despite the fact that ext4 supports 240char long filenames.
In addition to that if downloading this file with --mirror option the filename 
is truncated even more, because wget incorrectly assumes the path counts to the 
filesystem filename char limit.
This is very sad as I need to download a few dozen  thousands of small files 
and the filenames have to be exactly the same. Is there a way to prevent wget 
from renaming files or prevent it from downloading files with filenames too 
long or deal with this somehow else?
```

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