[Enhancement](audit log) Set print audit log sesssion variable defaul…

…t value to false (apache#38865)

## Proposed changes

In apache#38419, we introduced a new variable `enable_prepared_stmt_audit_log`
to make group commit faster. Here we set this session variable default
value to false.

<!--Describe your changes.-->

fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java

@@ -1615,7 +1615,7 @@ public void setEnableLeftZigZag(boolean enableLeftZigZag) {
     public String groupCommit = "off_mode";
 
     @VariableMgr.VarAttr(name = ENABLE_PREPARED_STMT_AUDIT_LOG, needForward = true)
-    public boolean enablePreparedStmtAuditLog = true;
+    public boolean enablePreparedStmtAuditLog = false;
 
     @VariableMgr.VarAttr(name = INVERTED_INDEX_CONJUNCTION_OPT_THRESHOLD,
             description = {"在match_all中求取多个倒排索引的交集时,如果最大的倒排索引中的总数是最小倒排索引中的总数的整数倍,"