Fix gRPC error handling for mirror-gateway handler #99

Job	Run time
dump-contexts-to-log	3s
dump-contexts-to-log	3s
detect-ci-container / detect	6s
detect-ci-container / detect	6s
E2E test (Stream CRUD: skip strict exist check)	13m 44s
E2E test (Stream CRUD: skip strict exist check)	13m 44s
E2E test (Stream CRUD)	9m 48s
E2E test (Stream CRUD)	9m 48s
E2E test (Multi-APIs CRUD)	5m 29s
E2E test (Multi-APIs CRUD)	5m 29s
E2E test (Jobs)	7m 46s
E2E test (Jobs)	7m 46s
E2E test (Stream CRUD) for operator	10m 5s
E2E test (Stream CRUD) for operator	10m 5s
E2E test (Stream CRUD) under index management jobs	9m 35s
E2E test (Stream CRUD) under index management jobs	9m 35s
E2E test (Stream CRUD) with read replica	1m 8s
E2E test (Stream CRUD) with read replica	1m 11s
E2E test (Stream CRUD) with mirror	1m 46s
E2E test (Stream CRUD) with mirror	11m 50s
Slack notification	0s
Slack notification	0s
	2h 9m 7s

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