Enable message names to show up in properties panel

[sbuettner]

What should we do?

Currently, message names are hidden by default in Connector element templates for inbound Connectors. This can lead to confusion in case of duplicate message names which can occur when copy&pasting a BPMN as there is no easy way to inspect message names.

We should not hide these properties but make them show up in the element templates by removing the Hidden property type and using a string.

Related web-modeler issue: https://github.com/camunda/web-modeler/issues/17267

Why should we do it?

We receive more and more support requests due to duplicate message names after users copy and modify existing BPMN files but are currently stuck as they cant easily change the message names themselves in the properties panel.

[sbuettner]

We discussed this topic in the weekly. Adding the property and showing the in the properties would at least enable customers to change the name themselves.

Idea for web-modeler: Optionally regenerate the message name during import (as an option). Web-Modeler could also do an internal search if a message name is already used.

@crobbins215 to discuss this with @Tally-e

[crobbins215]

https://github.com/camunda/web-modeler/issues/17267#issuecomment-3890262543, also messaged you @Tally-e