explicit statement env 'BOOKIE_MEM' and 'BOOKIE_GC' for values-mini.y…

…aml (apache#6340)

Fixes apache#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 apache#6338;

Then I looked into the details how these env-vars[ were used](https://github.com/apache/pulsar/blob/28875d5abc4cd13a3e9cc4f59524d2566d9f9f05/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](https://github.com/apache/pulsar/blob/28875d5abc4cd13a3e9cc4f59524d2566d9f9f05/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](https://github.com/apache/pulsar/blob/df152109415f2b10dd83e8afe50d9db7ab7cbad5/conf/standalone.conf#L576) says it would to use 10% of the direct memory size by default.

(cherry picked from commit 7d4df99)

deployment/kubernetes/helm/pulsar/values-mini.yaml

@@ -146,7 +146,8 @@ bookkeeper:
   ## templates/bookkeeper-configmap.yaml
   ##
   configData:
-    PULSAR_MEM: "\"-Xms128m -Xmx256m -XX:MaxDirectMemorySize=128m -Dio.netty.leakDetectionLevel=disabled -Dio.netty.recycler.linkCapacity=1024 -XX:+UseG1GC -XX:MaxGCPauseMillis=10 -XX:+ParallelRefProcEnabled -XX:+UnlockExperimentalVMOptions -XX:+AggressiveOpts -XX:+DoEscapeAnalysis -XX:ParallelGCThreads=32 -XX:ConcGCThreads=32 -XX:G1NewSizePercent=50 -XX:+DisableExplicitGC -XX:-ResizePLAB -XX:+ExitOnOutOfMemoryError -XX:+PerfDisableSharedMem -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintHeapAtGC -verbosegc -XX:G1LogLevel=finest\""
+    BOOKIE_MEM: "\"-Xms128m -Xmx256m -XX:MaxDirectMemorySize=128m -Dio.netty.leakDetectionLevel=disabled -Dio.netty.recycler.linkCapacity=1024 -XX:+ParallelRefProcEnabled -XX:+UnlockExperimentalVMOptions -XX:+AggressiveOpts -XX:+DoEscapeAnalysis -XX:ParallelGCThreads=32 -XX:ConcGCThreads=32 -XX:G1NewSizePercent=50 -XX:+DisableExplicitGC -XX:-ResizePLAB -XX:+ExitOnOutOfMemoryError -XX:+PerfDisableSharedMem\""
+    BOOKIE_GC: "\"-XX:+UseG1GC -XX:MaxGCPauseMillis=10\""
     PULSAR_PREFIX_dbStorage_writeCacheMaxSizeMb: "32"
     PULSAR_PREFIX_dbStorage_readAheadCacheMaxSizeMb: "32"
     PULSAR_PREFIX_journalMaxSizeMB: "2048"