Render HTML in element template descriptions

[pinussilvestrus]

Is your feature request related to a problem? Please describe

In element templates, it is possible to add HTML to property descriptions.

{
  "label": "Hostname",
  "description": "Specify the email server (SMTP) host name. Find some documentation <a href='https://docs.camunda.io'>here</a>",
  "type": "String",
  "binding": {
    "type": "zeebe:input",
    "name": "HOST_NAME"
  }
}

However, this is not possible for the general elementTemplate.description

{
  "$schema": "https://unpkg.com/@camunda/zeebe-element-templates-json-schema/resources/schema.json",
  "name": "Email Connector",
  "id": "EmailConnector",
  "description": "Find some documentation <a href='https://docs.camunda.io'>here</a>",
  "appliesTo": [
    "bpmn:Task"
  ],
  "properties": []
}

Describe the solution you'd like

Make it possible to also provide HTML in element template descriptions.

Describe alternatives you've considered

/

Additional context

This does not solve that documentation URLs should be more visible on the properties panel header (cf. #616).

Cf. #549

[pinussilvestrus]

Also to consider: render these descriptions properly in the Catalog Modal

[nikku]

Also consider: If we go that route we need to support it everywhere, i.e. also in element template chooser as well as the connectors extension.

[nikku]

I'd personally not go down this route, given that it is easy to link documentation via documentationRef (#616). This is not the case for property descriptions.

We could also feature the documentation link in the Template section, to have description + name + link to documentation closer to each other.

[MaxTru]

cc @andreasgeier