[branch-2.1][fix](jdbc catalog) Fixed FE memory leak by enabling weak…

… references in HikariCP (apache#40923)

pick  (apache#40773)

When FE collects statistics, its ThreadLocal will hold the ThreadLocal
of HikariCP in JdbcClient, making it difficult for HikariCP to be gc, so
this problem can be alleviated by enabling weak references of HikariCP.

fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcClient.java

@@ -99,6 +99,7 @@ public static JdbcClient createJdbcClient(JdbcClientConfig jdbcClientConfig) {
     }
 
     protected JdbcClient(JdbcClientConfig jdbcClientConfig) {
+        System.setProperty("com.zaxxer.hikari.useWeakReferences", "true");
         this.catalogName = jdbcClientConfig.getCatalog();
         this.jdbcUser = jdbcClientConfig.getUser();
         this.isOnlySpecifiedDatabase = Boolean.parseBoolean(jdbcClientConfig.getOnlySpecifiedDatabase());