ParameterTableReferenceMigrators: Traverse entire model

* Migrate also TaskArchitecture in ModelElementSnapshots (not just
  the primary root elements)

Issue-Ref: 4121
Issue-Url: #4121

Signed-off-by: Simon Barner <barner@fortiss.org>
1 job for !32 with 4121
detached
Status Job ID Name Coverage
  Test
passed downstream-job