tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

ftp: a 550 response to SIZE returns CURLE_REMOTE_FILE_NOT_FOUND

This is primarily interesting for cases where CURLOPT_NOBODY is set as
previously curl would not return an error for this

ftp: a 550 response to SIZE returns CURLE_REMOTE_FILE_NOT_FOUND

This is primarily interesting for cases where CURLOPT_NOBODY is set as
previously curl would not return an error for this case.

MDTM getting 550 now also returns this error (it returned
CURLE_FTP_COULDNT_RETR_FILE before) in order to unify return codes for
missing files across protocols and specific FTP commands.

libcurl already returns error on a 550 as a MDTM response (when
CURLOPT_FILETIME is set). If CURLOPT_NOBODY is not set, an error would
happen subsequently anyway since the RETR command would fail.

Add test 1913 and 1914 to verify. Updated several tests accordingly due
to the updated SIZE behavior.

Reported-by: Tomas Berger
Fixes #5953
Closes #5957

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