We were calling the wrong Beacon API method to send system info
data to HelpScout when users create tickets inside WordPress. This
commit fixes this by calling the method `session-data` instead of
`identify`. It is likely that `identify` was the correct method in the
past, but the Beacon API changed
(https://developer.helpscout.com/beacon-2/web/javascript-api/).
Nowadays, the `identify` method is used to add data to the HelpScout
users and fields need to be created in advance in the HelpScout web
interface. `session-data` is used to add information to the ticket which
is what we are trying to achieve. Only `name` and `email` should still
be passed to `identify` to make it possible to match the correct
HelpScout user.
[MAILPOET-4525]
