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/test799

@@ -42,12 +42,12 @@ IMAP with --login-options 'AUTH=+LOGIN'
 #
 # Verify data after the test has been "shot"
 <verify>
-<protocol>
-A001 CAPABILITY
-A002 LOGIN user secret
-A003 SELECT %TESTNUMBER
-A004 FETCH 1 BODY[]
-A005 LOGOUT
+<protocol crlf="yes">
+A001 CAPABILITY
+A002 LOGIN user secret
+A003 SELECT %TESTNUMBER
+A004 FETCH 1 BODY[]
+A005 LOGOUT
 </protocol>
 </verify>
 </testcase>