pgAdmin 4 commit: Fixed following SoanrQube issues

Fixed following SoanrQube issues   1) Rename field "node_type" to prevent any misunderstanding/clash with field "NODE_TYPE" defined.   2) Define a constant instead of duplicating this literal. Solution: 1) Rename the field "NODE_TYPE" and "COLLECTION_LABEL" to "_NODE_TYPE" and "_COLLECTION_LAB

pgAdmin 4 commit: Fixed following SoanrQube issues:

Fixed following SoanrQube issues:   1) Variables should not be shadowed.   2) Variables and functions should not be redeclared. Branch -- master Details --- https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=776bec0d824eb9187e1a3eff2c401d422002f642 Author: Yogesh Mahajan Mo