[release-1.14] Fix ProxyConfig merge impacting shared state #40517
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The issue was we were overriding things by setting them to pointers. These pointers are then shared, and when `proto.merge` is used they are all mutated. Instead, take deepcopies and add a test
GregHanson
approved these changes
Aug 17, 2022
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This is an automated cherry-pick of #40494