Add a route to AA to get notifications

[ZitaNemeckova]

SUMMARY

Adds a route that asks AA for notifications

Depends on https://gitlab.cee.redhat.com/automation-analytics/automation-analytics-backend/-/merge_requests/786 Fixes https://issues.redhat.com/browse/AA-1546

ISSUE TYPE

• New or Enhanced Feature

COMPONENT NAME

• API

AWX VERSION

awx: 22.5.1.dev16+gf3969546ca