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/test1187

@@ -41,26 +41,26 @@ smtp://%HOSTIP:%SMTPPORT/%TESTNUMBER --mail-rcpt recipient@example.com --mail-fr
 s/^--------------------------[A-Za-z0-9]*/------------------------------/
 s/boundary=------------------------[A-Za-z0-9]*/boundary=----------------------------/
 </strippart>
-<protocol>
-EHLO %TESTNUMBER
-MAIL FROM:<sender@example.com>
-RCPT TO:<recipient@example.com>
-DATA
-QUIT
+<protocol crlf="yes">
+EHLO %TESTNUMBER
+MAIL FROM:<sender@example.com>
+RCPT TO:<recipient@example.com>
+DATA
+QUIT
 </protocol>
-<upload>
-Content-Type: multipart/mixed; boundary=----------------------------
-Mime-Version: 1.0
-
-------------------------------
-
-This is the mail text
-------------------------------
-Content-Disposition: attachment; filename="strange\\file\"name"
-
-File content
---------------------------------
-.
+<upload crlf="yes">
+Content-Type: multipart/mixed; boundary=----------------------------
+Mime-Version: 1.0
+
+------------------------------
+
+This is the mail text
+------------------------------
+Content-Disposition: attachment; filename="strange\\file\"name"
+
+File content
+--------------------------------
+.
 </upload>
 </verify>
 </testcase>