feat: add "e2ee encrypted" info message to all e2ee chats (#7008)

this PR adds a info message "messages are end-to-end-encrypted" also for
chats created by eg. vcards. by the removal of lock icons, this is a
good place to hint for that in addition; this is also what eg. whatsapp
and others are doing

the wording itself is tweaked at
https://github.com/deltachat/deltachat-android/pull/3817 (and there is
also the rough idea to make the message a little more outstanding, by
some more dedicated colors)

~~did not test in practise, if this leads to double "e2ee info messages"
on secure join, tests look good, however.~~ EDIT: did lots of practise
tests meanwhile :)

most of the changes in this PR are about test ...

ftr, in another PR, after 2.0 reeases, there could probably quite some
code cleanup wrt set-protection, protection-disabled etc.

---------

Co-authored-by: Hocuri <hocuri@gmx.de>

test-data/golden/chat_test_parallel_member_remove

@@ -1,7 +1,8 @@
 Group#Chat#10: Group chat [3 member(s)] 
 --------------------------------------------------------------------------------
-Msg#10🔒:  (Contact#Contact#10): Hi! I created a group. [FRESH]
-Msg#11🔒: Me (Contact#Contact#Self): You left. [INFO] √
-Msg#12🔒:  (Contact#Contact#10): Member charlie@example.net added by alice@example.org. [FRESH][INFO]
-Msg#13🔒:  (Contact#Contact#10): What a silence! [FRESH]
+Msg#10: info (Contact#Contact#Info): Messages are end-to-end encrypted. [NOTICED][INFO]
+Msg#11🔒:  (Contact#Contact#10): Hi! I created a group. [FRESH]
+Msg#12🔒: Me (Contact#Contact#Self): You left. [INFO] √
+Msg#13🔒:  (Contact#Contact#10): Member charlie@example.net added by alice@example.org. [FRESH][INFO]
+Msg#14🔒:  (Contact#Contact#10): What a silence! [FRESH]
 --------------------------------------------------------------------------------

test-data/golden/test_outgoing_encrypted_msg

@@ -1,5 +1,5 @@
 Single#Chat#10: bob@example.net [KEY bob@example.net] 🛡️
 --------------------------------------------------------------------------------
-Msg#10: info (Contact#Contact#Info): Messages are guaranteed to be end-to-end encrypted from now on. [NOTICED][INFO 🛡️]
+Msg#10: info (Contact#Contact#Info): Messages are end-to-end encrypted. [NOTICED][INFO 🛡️]
 Msg#11🔒: Me (Contact#Contact#Self): Test – This is encrypted, signed, and has an Autocrypt Header without prefer-encrypt=mutual.  √
 --------------------------------------------------------------------------------

test-data/golden/test_outgoing_mua_msg_pgp

@@ -1,6 +1,6 @@
 Single#Chat#10: bob@example.net [KEY bob@example.net] 🛡️
 --------------------------------------------------------------------------------
-Msg#10: info (Contact#Contact#Info): Messages are guaranteed to be end-to-end encrypted from now on. [NOTICED][INFO 🛡️]
+Msg#10: info (Contact#Contact#Info): Messages are end-to-end encrypted. [NOTICED][INFO 🛡️]
 Msg#11🔒:  (Contact#Contact#10): Heyho from DC [FRESH]
 Msg#13🔒: Me (Contact#Contact#Self): Sending with DC again  √
 --------------------------------------------------------------------------------

test-data/golden/two_group_securejoins

@@ -4,6 +4,6 @@ Msg#11: info (Contact#Contact#Info): alice@example.org invited you to join this
 
 Waiting for the device of alice@example.org to reply… [NOTICED][INFO]
 Msg#13: info (Contact#Contact#Info): alice@example.org replied, waiting for being added to the group… [NOTICED][INFO]
-Msg#17: info (Contact#Contact#Info): Messages are guaranteed to be end-to-end encrypted from now on. [NOTICED][INFO 🛡️]
+Msg#17: info (Contact#Contact#Info): Messages are end-to-end encrypted. [NOTICED][INFO 🛡️]
 Msg#18🔒:  (Contact#Contact#10): Member Me added by alice@example.org. [FRESH][INFO]
 --------------------------------------------------------------------------------