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/test969

@@ -14,10 +14,10 @@ IDN
 <servercmd>
 CAPA SMTPUTF8
 </servercmd>
-<data>
-250-Joe Smith <joe.smith@example.com>
-250-Harry Smith <harry.smith@example.com>
-250 Melvin Smith <melvin.smith@example.com>
+<data crlf="yes">
+250-Joe Smith <joe.smith@example.com>
+250-Harry Smith <harry.smith@example.com>
+250 Melvin Smith <melvin.smith@example.com>
 </data>
 </reply>
 
@@ -42,10 +42,10 @@ smtp://%HOSTIP:%SMTPPORT/%TESTNUMBER --mail-rcpt Friends -X EXPN
 #
 # Verify data after the test has been "shot"
 <verify>
-<protocol>
-EHLO %TESTNUMBER
-EXPN Friends SMTPUTF8
-QUIT
+<protocol crlf="yes">
+EHLO %TESTNUMBER
+EXPN Friends SMTPUTF8
+QUIT
 </protocol>
 </verify>
 </testcase>