Support call activity mapping in instance migration mode

[pedesen]

Description

Zeebe will support migration of process instances with call activities. Operate needs to enable users to map call activities in instance migration mode.

User Story

Scenario: As an Operate user
    Given I am in instance migration mode (mapping step)
    When I select a call activity as source element
    Then I can select a call activity as target element

Acceptance Criteria

• [x] Call activities are available in the list of source elements
• [x] Call activities are selectable in the source diagram
• [x] Source call activities are mappable to target call activities
• [x] Source call activities can only be mapped to call activities (not to other element types)
• [x] https://github.com/camunda/camunda-docs/issues/3834
• [ ] https://github.com/camunda/zeebe/pull/18742

Definition of Ready - Checklist

• [x] The issue has a meaningful title, description, and testable acceptance criteria
• [ ] If documentation needs to be updated, an issue is created in the camunda-docs repo, and the issue is added to our Operate project board.
• [ ] If HELM charts need to be updated, an issue is created in the camunda-platform-heml repo, and the issue is added to our Operate project board.
• [ ] Potential Security risks have been considered and added to the product-hub issue risk assessment
• [ ] Cross-team dependencies have been considered

Optional:

• [ ] Design input has been collected by the assignee

  :point_right: Handover Dev to QA

• Handy resources: BPMN/DMN models, plugins, scripts, REST API endpoints + example payload, etc :

• Example projects:

• Versions to validate:

  Docker file : in case that it needed to be tested via docker share the version contain the fixed along with version of other services .

• Release version ( in which version this fixed/feature will be released)

:green_book: Link to the test case

[aleksander-dytko]

@johanwelgemoed can we please prioritze this one? ☝️