tests: use crlf=yes attribute more

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

tests/data/test860

@@ -30,12 +30,12 @@ pop3://%HOSTIP:%POP3PORT -u user:secret -X NOOP -I
 #
 # Verify data after the test has been "shot"
 <verify>
-<protocol>
-CAPA
-USER user
-PASS secret
-NOOP
-QUIT
+<protocol crlf="yes">
+CAPA
+USER user
+PASS secret
+NOOP
+QUIT
 </protocol>
 </verify>
 </testcase>