Delegate ZK Chroot initialization to Solr

[HoustonPutman]

Thanks to https://issues.apache.org/jira/browse/SOLR-7642, starting with Solr 8.11, the Solr Operator no longer needs to have code to initialize a Zookeeper chRoot if one is provided by the user.

The Solr Operator v0.8.0 now accepts a minimum Solr version of 8.11 (#616), so we are good to start using this feature.

[HoustonPutman]

So I found this issue while making the PR: SOLR-17019

Unfortunately, we will need to keep the mkroot command when we are using TLS. At least until 9.5 is the minimum supported version.

[HoustonPutman]

Let's leave this for a later version, as there is no immediate need for the change, given that Solr still has some bugs in the area.