Allow Redis TLS to be disabled

[kmcrawford]

If using a custom installation of Redis the adding REDIS_TLS_DISABLED allows for optional Redis configuration.

 const redisConfig = {
        host: process.env.REDIS_HOST,
        port: process.env.REDIS_PORT,
      };
      if (process.env.REDIS_KEY) {
        redisConfig["auth_pass"] = process.env.REDIS_KEY;
      }
      if (!process.env.REDIS_TLS_DISABLED) {
        redisConfig["tls"] = {
          rejectUnauthorized: true,
        };
      }

[kmcrawford]

Additionally this also allows for optional REDIS_KEY
The current code has it as required, when the documentation has it as optional.

https://github.com/microsoft/code-push-server/blob/main/api/script/redis-manager.ts#L105

[lucen-ms]

We have updated the documentation:

• Redis is required for Metrics to work.
• TLS is required for Redis.

[kmcrawford]

Redis TLS is required if you are running using Azure to host code push. If your infrastructure requires you to run on another cloud, than TLS is not required. I am fine closing this and leaving this as an option in my fork.