"Test against stream" drop down isn't sorted #18694

Expected Behavior

The list of streams in the drop-down should be in a defined order.

Current Behavior

The sort order seems undefined. If it was Object ID, then All Messages would be at the top, but it isn't.
It's also not alphabetically, which is probably should be.

Possible Solution

Use a stable sort on the list of streams.

Steps to Reproduce (for bugs)

1. Open a message on a search result.
2. Choose the "Test against stream" drop-down.

Your Environment

• Graylog Version: 6.0.0-SNAPSHOT+090c7c4