Global references are not kept when replacing an event (interrupting to non-interrupting)

[nikku]

Describe the Bug

I replace an event (i.e. a boundary event) from interrupting to non-interrupting. I see that the global message reference gets lost.

We have existing test cases for the desired behavior (reference is kept), but due to nested it(..., function() { it(...); } calls these are not actually executed 🙈.

#2248 uncovered this miss-use, and the bug.

Steps to Reproduce

1. Uncomment these tests
2. See that test suite fails

Expected Behavior

When replacing an event (toggling interrupting / non-interrupting) we keep the global element reference.

Environment

• Browser: Any
• OS: Any
• Library version: v17.1.0

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Related to #1906

[sombrek]

Cf. #1906