Minor Test refactor: avoid creating the same SchemaRef #17951
                
     Merged
            
            
          
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Which issue does this PR close?
N/A
Rationale for this change
While working on an upgrade, I noticed the same schema was created by many distinct tests (and I am about to do it again).
Since the schema is always the same and is wrapped in an
Arcwe can just clone the ArcWhat changes are included in this PR?
Use a
static LazyLockto create the schema once and just pass out a reference to itAre these changes tested?
Yes by CI
Are there any user-facing changes?
No this is a test change only