Part 2 of #2197
Zabbix has two ways of processing and returning proxies depending on the
zabbix version being used:
1. Before 7.0.0 it uses `host`
2. After 7.0.0 it uses `name`
when we made the call to the backend, we accounted for this
[difference](592380851c/src/datasource/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts (L940C5-L944C6)).
However, in the frontend, we always populated the dropdown using
`proxy.host` regardless of the version customers were using.
So for customers that had proxies in their zabbix set up AND were using
a zabbix version `>-7.0.0`, the query editor would crash because we
ended up with a list of undefined options.
This PR changes it so that when `host` is not present, it uses `name` or
otherwise defaults to `''` to ensure that we never have and array of
options with undefined values.
3a4f3280be