[Security Solution] Anomalies Tables only show data for installed ML Jobs

[rylnd]

As part of #74582 I discovered some interesting behavior: when querying anomalies for our anomalies tables, we only include jobs that are currently installed.

My concern is that if anomalies persist after a job has been deleted, we may be inadvertently hiding those anomalies with this logic. This ticket is meant to track verification of the above.

[elasticmachine]

Pinging @elastic/siem (Team:SIEM)

[rylnd]

Update: after talking with ML, it turns out that anomalies are indeed deleted along with the job that created them, so this logic is sound 👍