[Logs] Anomaly detection license prompt copy around trial period is incorrect

[formgeist]

Kibana version: master

Summary

I noticed in #69288 and specifically https://github.com/elastic/kibana/pull/69288/files#diff-3b759faa121d28f9d64cd56806562e8fR64 that the trial period is described as 14 days, when actually the Platinum license trial period is 30 days (https://www.elastic.co/guide/en/elasticsearch/reference/current/start-trial.html)

[elasticmachine]

Pinging @elastic/logs-metrics-ui (Team:logs-metrics-ui)

[jasonrhodes]

Good catch, @formgeist -- we should just remove the time part of this sentence and say "our free trial".

[afgomez]

Should we quickly fix this for 7.9?