storage: only messages should drive generator capability #21499
Merged
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Motivation
Fixes a bug introduced in #21842 and detected by @guswynn here https://github.com/MaterializeInc/materialize/pull/21482/files#r1310695260
Fixes MaterializeInc/database-issues#6462
Tips for reviewer
Checklist
$T ⇔ Proto$T
mapping (possibly in a backwards-incompatible way), then it is tagged with aT-proto
label.