feat: remove unique index uk_casbin_rule from CasbinRule model to res… #8262

Job	Run time
compatibility_e2e_tests (scheduler)	41m 32s
compatibility_e2e_tests (manager)	42m 1s
compatibility_e2e_tests (seed-client)	42m 38s
compatibility_e2e_tests (client)	44m 40s
	2h 50m 51s

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