Commit after schema creation for GC tool (#8290)

By default the connections from JDBC datasource do not have autocommit
on, so when we create schema the results of that creation are then
rolled back.  This change is intentional about commiting the schema
changes.

gc/gc-tool/src/main/java/org/projectnessie/gc/tool/cli/commands/JdbcCreateSchema.java

@@ -45,6 +45,8 @@ protected Integer call(Closeables closeables) throws Exception {
     }
     try (Connection conn = dataSource.getConnection()) {
       schemaCreateStrategy.apply(conn);
+      // by default autocommit is set to false, so we commit here
+      conn.commit();
     }
     commandSpec
         .commandLine()