Separate tests for:
- Embedded args as a literal string
- Embedded args as a variable

RF 7.3.1 (#5444) broke using Run Keyword and setup/teardown with
embedded arguments that matched only after replacing variables.

Fixes #5455.

Most importantly, fix regression with French `Étant donné`, `Et` and
`Mais` prefixes not working with keyword names starting with `que` or
`qu'`.

Fixes #5456.

Messages and keywords by the end_test listener method overrode test's
body if test had a teardown and JSON output was used. This was due to
there being two `body` items in this case. The issue was fixed by
merging duplicate JSON items that have lists as values.

Fixes #5463.

Added teardown to the widely used pass_and_fail.robot file required
updating various unrelated tests.