[improve][test] Clear fields in AuthZTest classes at cleanup #22661
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Motivation
Follow up on #22583. TestNG keeps strong references to test class instances for the duration of the test run. (testng-team/testng#1461) This causes a memory leak in test runtime.
The way to workaround this is to clear fields at cleanup.
Modifications
Clear fields for AuthZTest classes
Documentation
docdoc-requireddoc-not-neededdoc-complete