Define - Instant preview dashboard

Technical solution proposal:

• tobias.conz creates an epic. FE + BE: Create a "explanation widget" report, that allows you to add an icon and a static text. Same as https://github.com/camunda/product-hub/issues/566?
• FE: Empty state view, create point of entry as described here: https://docs.google.com/document/d/12jOoKtI4xPzUWBnxOUe5IZ5poLHpOSpksVpCTqvlhR8/edit#
  PM: tobias.conz Redo the design from Empty state view to instant preview dashboard
• PM: Definition of the instant preview dashboard layout
• FE+BE: Take care of what happens when user navigates with invalid process definition key or one to which the user has no access. To be handled in OPT-6670/OPT-6671
• BE: Take care of permission concept for the instant preview dashboard, who can see it? To be handled in OPT-6670
• BE: Upon importing a process definition, create the instant preview dashboard immediately, which has a predictable URL to be called. To be handled in OPT- 6670/OPT-6671 
• BE: The dashboard template is a JSON file with a fixed name (location and name TBD). Depending on the query parameter values, a new template can be used. Like this we can have several templates. To be handled in OPT-6670
• Doc: Document the new feature in the docs. To be handled in OPT-6672
• Mixpanel: Event for ever access to a Preview dashboard. Make the instant preview dashboard trackable in Mixpanel https://confluence.camunda.com/display/HAN/Collecting%2BTelemetry%2BData%253A%2BBest%2BPractices&sa=D&source=docs&ust=1670600066148497&usg=AOvVaw3LOSSFHJgfQ7AySn_-fV2N  handled in OPT-6673
• BE: Preview Dashboard callable as an iFrame > Accessible from everywhere or just when user has a valid cookie/permission? Outcome: Assume the user has a valid permission to access the dashboard. Sync with Operate so that it is easily "embedabble" in Operate. Modeler would also be a possibility. Operate has more priority. Handled in OPT-6670/OPT-6671
• BE: Reports from the Preview Dashboard need to be callable as an iFrame . Obsolete: If a specific report from a dashboard shall be called, then that can be accomplished by creating a new dashboard template that contains only that report