[ML] Show forecast button is not hidden when selecting another job.

[fake-haris]

Kibana version: 9.0.3

Elasticsearch version: 9.0.3

Browser version: chrome latest

Browser OS version: macOS

Original install method (e.g. download page, yum, from source, etc.): cloud deployment

Describe the bug: Show forecast button is not hidden when selecting another job.

Steps to reproduce:

1. Create anomaly detection jobs.
2. Create a forecast for a job.
3. Select another job.

Expected behavior: Show forecast button shouldn't be present in page.

Actual behavior: Show forecast button is present in page.

Additional information: If you refresh the page button disappears.

forecast.issue.mov

[elasticmachine]

Pinging @elastic/ml-ui (:ml)