[v1.7.0 deprecation] Remove features marked deprecated in #3001 #3714
Description
#3001 (deprecation: Indicate that admin mutation GETs are deprecated.) introduced a deprecation notice for v1.7.0. This issue tracks source code cleanup.
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#3001 (deprecation: Indicate that admin mutation GETs are deprecated.) introduced a deprecation notice for v1.7.0. This issue tracks source code cleanup.