Fixes#6338
### Motivation
This commit started while I was using helm in my local minikube, noticed that there's a mismatch between `values-mini.yaml` and `values.yaml` files. At first I thought it was a copy/paste error. So I created #6338;
Then I looked into the details how these env-vars[ were used](28875d5abc/conf/bkenv.sh (L36)), found out its ok to use `PULSAR_MEM` as an alternative. But it introduce problems:
1. Since `BOOKIE_GC` was not defined , the default [BOOKIE_EXTRA_OPTS](28875d5abc/conf/bkenv.sh (L39)) will finally use default value of `BOOKIE_GC`, thus would cover same the JVM parameters defined prior in `PULSAR_MEM`.
2. May cause problems when bootstrap scripts changed in later dev, better to make it explicitly.
So I create this pr to solve above problems(hidden trouble).
### Modifications
As mentioned above, I've made such modifications below:
1. make `BOOKIE_MEM` and `BOOKIE_GC` explicit in `values-mini.yaml` file. Keep up with the format in`values.yaml` file.
2. remove all print-gc-logs related args. Considering the resource constraints of minikube environment. The removed part's content is `-XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintHeapAtGC -verbosegc -XX:G1LogLevel=finest`
3. leave `PULSAR_PREFIX_dbStorage_rocksDB_blockCacheSize` empty as usual, as [conf/standalone.conf#L576](df15210941/conf/standalone.conf (L576)) says it would to use 10% of the direct memory size by default.
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