Flaky tests on cluster executors

[mijicd]

API tests occasionally fail with protocol errors when running on cluster executor. For example:

      - Redis commands - Cluster executor - keys - set followed by get
        Exception in thread "zio-fiber-1531" zio.redis.RedisError$ProtocolError: null
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe.recover(ClusterExecutor.scala:51)
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe.recover(ClusterExecutor.scala:53)
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe(ClusterExecutor.scala:57)
        	at zio.redis.internal.RedisCommand.run(RedisCommand.scala:32)
        	at zio.redis.internal.RedisCommand.run(RedisCommand.scala:33)
        	at zio.redis.KeysSpec.keysSuite(KeysSpec.scala:18)
        	at zio.redis.KeysSpec.keysSuite(KeysSpec.scala:13)
      - Redis commands - Cluster executor - keys - setGet with non-existing key
        Exception in thread "zio-fiber-2217" zio.redis.RedisError$ProtocolError: null
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe.recover(ClusterExecutor.scala:51)
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe.recover(ClusterExecutor.scala:53)
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe(ClusterExecutor.scala:57)
        	at zio.redis.internal.RedisCommand.run(RedisCommand.scala:32)
        	at zio.redis.internal.RedisCommand.run(RedisCommand.scala:33)
        	at zio.redis.KeysSpec.keysSuite(KeysSpec.scala:27)
        	at zio.redis.KeysSpec.keysSuite(KeysSpec.scala:22)
      - Redis commands - Cluster executor - keys - setGet with the existing key
        Exception in thread "zio-fiber-2903" zio.redis.RedisError$ProtocolError: null
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe.recover(ClusterExecutor.scala:51)
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe.recover(ClusterExecutor.scala:53)
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe(ClusterExecutor.scala:57)
        	at zio.redis.internal.RedisCommand.run(RedisCommand.scala:32)
        	at zio.redis.internal.RedisCommand.run(RedisCommand.scala:33)
        	at zio.redis.KeysSpec.keysSuite(KeysSpec.scala:35)
        	at zio.redis.KeysSpec.keysSuite(KeysSpec.scala:30)
      - Redis commands - Cluster executor - keys - get non-existing key
        Exception in thread "zio-fiber-3589" zio.redis.RedisError$ProtocolError: null
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe.recover(ClusterExecutor.scala:51)
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe.recover(ClusterExecutor.scala:53)
        	at zio.redis.internal.ClusterExecutor.execute.executeSafe(ClusterExecutor.scala:57)
        	at zio.redis.internal.RedisCommand.run(RedisCommand.scala:32)
        	at zio.redis.internal.RedisCommand.run(RedisCommand.scala:33)
        	at zio.redis.KeysSpec.keysSuite(KeysSpec.scala:44)
        	at zio.redis.KeysSpec.keysSuite(KeysSpec.scala:40)

I have temporary ignored them (via ifEnvNotSet) to stabilize the CI.

[mijicd]

cc @anatolysergeev