Message tooltip is misleading for message start events

[nikku]

Describe the bug

Implementing a message start event I cannot define a correlation key, still we indicate to the user that this is the case:

I propose we simplify that hint, now that we have separate hinting for correlation key in place (#4833).

Steps to reproduce

1. Model message start event
2. See that correlation key "should be modeled", according to the Message section tooltip

Expected behavior

• Tooltips only provide us with hints that can be applied.

Environment

• OS: Linux (Ubuntu)
• Camunda Modeler Version: v5.33.0-rc.1
• Execution Platform: Camunda 8
• Installed plug-ins: None

Additional context

Found in the context of #4825.

[barmac]

This makes sense, and is a quick fix.

[barmac]

Fixable in bpmn-io/bpmn-js-properties-panel (look for tooltip provider).