To make special newlines more explicit and visible.
Mostly in `<protocol>` sections, some in `<data*>` and `<upload>`.
Reducing the number of `tests/data/test*`:
- CRLF newlines from 21535 to 11337.
- files with mixed newlines from 1335 to 707.
Also delete empty `<protocol>` sections.
Closes#19284
When failing to create the output file for saving an etag, only fail
that particular single transfer and allow others to follow.
In a serial transfer setup, if no transfer at all is done due to them
all being skipped because of this error, curl will output an error
message and return exit code 26.
Added test 369 and 370 to verify.
Reported-by: Earnestly on github
Ref: #7942Closes#7945