Add support for versionTag binding for user tasks

[jfriedenstab]

Problem you would like to solve

As a Camunda 8 user, I'd like to use versionTag binding for user tasks, so that I can specify a specific version of the Camunda Form to be linked.

Proposed solution

• The new option "version tag" (value: versionTag) is added to the "Binding" dropdown in the "Form" section of the properties panel.
• If "version tag" is selected, an additional input field "Version tag" is displayed.
• Version tag is removed when another binding type is selected
• The provided value is stored in the versionTag attribute of the zeebe:formDefinition extension element:

  <zeebe:formDefinition formId="foo" bindingType="versionTag" versionTag="v1" />

Alternatives considered

None

Additional context

• part of [EPIC] Support version tag binding for linked resources camunda#19812