Fix some memory leaks in redis-cli

[LuMingYinDetect]

Fix memory leak related to variable slot_nodes in the clusterManagerFixSlotsCoverage() function

[sundb]

@LuMingYinDetect Can you try to reproduce these leaks using redis-cli?

[LuMingYinDetect]

@LuMingYinDetect Can you try to reproduce these leaks using redis-cli?

The tool I use to check for memory leaks is the Clang Static Analyzer. It only provides information about the paths that trigger the defects and doesn't offer a specific test case. Therefore, I might not be able to reproduce the issue using redis-cli for now.

[sundb]

@LuMingYinDetect if there is any leak, when execute the following script we can see a leak report from sanitizer.

make SANITIZER=address
./src/redis-cli --eval test.lua

[LuMingYinDetect]

Correcting released memory objects.

[LuMingYinDetect]

@LuMingYinDetect if there is any leak, when execute the following script we can see a leak report from sanitizer.

make SANITIZER=address
./src/redis-cli --eval test.lua

Thank you for your detailed guidance!