Possible issues with the name construction of datamodel event tags

Following observations are from code (should be verified with test/runtime):
1. The rules name is not part of the tag
2. The format of the tag name constructed within `SubscriptionList.unsubscribe_while_deleting` doesn't conform with the format in the server-side construction

Start with the runtime tests and inspect SubscriptionList.unsubscribe_while_deleting alongside the server-side event-tag construction. Verify whether the rules name is included and whether the generated tag format matches the server-side format; done means the behavior is confirmed or corrected with runtime test coverage.

Written by the indexing model from the issue text.