[Chapel Merge] Put in stopgap to avoid a failure in nightly testing tonight

Branch: refs/heads/main
Revision: b4e395598a16b4eb5561a776ee5981eb909fd14a
Author: bradcray
Link: Put in stopgap to avoid a failure in nightly testing tonight by bradcray · Pull Request #29288 · chapel-lang/chapel · GitHub
Log Message:
Put in stopgap to avoid a failure in nightly testing tonight (#29288)

Due to a long merge cycle, Jade's #28856 conflicted with my #29253 from
last week and broke the output of this test, arguably making it worse.
Jade agrees that this is a backslide in behavior and has a fix underway,
but it's not going in today, so I'm committing the incorrect behavior
for now to avoid a slew of failure mails tonight and others potentially
seeing this in their paratests.

[trivial, not reviewed]

Compare: Comparing 708e6c8a621277ab9082d85f3f77a34d8563ec0b...af5e6b19f2ef84a272ea4f09985667bbc8bd9490 · chapel-lang/chapel · GitHub

Diff:
M test/types/unions/union-init-throws.good
https://github.com/chapel-lang/chapel/pull/29288.diff