Fix properties orphaned by dropping a label

AlterPropGraph() cleans up pg_propgraph_property entries that are
orphaned by dropping an element or by dropping properties associated
with an element.  But it did not clean up pg_propgraph_property
entries that are orphaned by dropping labels associated with an
element.  Fix this missing case.

Author: Ashutosh Bapat <[email protected]>
Author: zengman <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/tencent_76F6ACA2364EAA1E5DBD7A47%40qq.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/0e4f0827f63900374ce7352f1f9e4c39363218d0

Modified Files
--------------
src/backend/commands/propgraphcmds.c               |  2 +-
.../regress/expected/create_property_graph.out     | 23 +++++++++++-----------
src/test/regress/sql/create_property_graph.sql     |  5 +++++
3 files changed, 17 insertions(+), 13 deletions(-)

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