update code and tests to limit false sharing and unnecessary creation of globals #23631
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This is not intended to change the functionality being tested, just reduce the number of globals left around afterwards. Thus, it's not NFC, but it should be reasonably close. Since this resulted in a lot of indentation changes, the
?w=1
diff is a bit smaller, although still pretty large. Since this does need to hit quite a few files, I expect I'll eventually need to try to merge this fairly quickly.Ref #19324, as this is rebased from that PR based on Stefan's suggestion of #19324 (comment)