Replace all "redis" keywords to "valkey" in tcl test files

[hwware]

In test tcl files, a lot of "redis" keywords represent server，for example

spawn_instance redis $::redis_base_port $::instances_count {
        "enable-protected-configs yes"
        "enable-debug-command yes"
        "save ''"
}

We would like to use other words to replace the "redis"

Note: 1.Do not touch the words such as "redis_version" because in the info command, we will still keep these output 2. Do not change any RedisModule* words becuase we still want to keep it.

[daniel-house]

The word server seems much to dangerous to me. As we discussed off-line, there is at least one place where that word is already in use as the name of something. Please see https://github.com/valkey-io/valkey/blob/c0a83c00583ed2959079ae34ed8ca4cf7f90a264/tests/support/redis.tcl#L60

[zuiderkwast]

It is actually a client in most cases. :) Maybe it's safer to replace it with valkey... Or we can also leave it as "redis".

[madolson]

I'd vote just replace redis with valkey in the tests.

[zuiderkwast]

@hwware you're assigned to this issue so i'll let you decide about #287. It seems to be overlapping a bit with you pr #283.

[madolson]

@hwware Is this still needed?

[hwware]

I think I can close this. Thanks for ping me.

[zuiderkwast]

OK, but we have still many occurrences of "redis" in TCL test files. Many of them are Lua code like return redis.call('get','x') where we could replace redis.call with server.call.