ST_ChangeEdgeGeom allows breaking side face labeling

[strk]

Easy test:

SELECT NULL FROM DropTopology('tc');                                                                                                                                                           
SELECT NULL FROM CreateTopology('tc');                                                                                                                                                         
SELECT NULL FROM TopoGeo_addLinestring('tc', 'LINESTRING(0 0, 5 5, 10 0)');                                                                                                                    
SELECT NULL FROM TopoGeo_addLinestring('tc', 'LINESTRING(0 0, 10 0)');                                                                                                                         
SELECT * FROM ValidateTopology('tc');                                                                                                                                                          
SELECT NULL FROM ST_ChangeEdgeGeom('tc', 1, 'LINESTRING(0 0, 5 -5, 10 0)');                                                                                                                    
SELECT * FROM ValidateTopology('tc');            

[strk]

This bug is the probable cause of #5786

The code checking for consistent topology only verifies that the next CW and CCW edges are the same as before the move, but this is still the case when you have only 2 edges incident to the endpoints, so I guess the missing check is that the rings formed on both sides of the edge being moved are still having the original winding (CW or CCW)

[strk]

Fix for this issue: ​https://git.osgeo.org/gitea/postgis/postgis/pulls/224

Unfortunately the fix doesn't help with #5786

[Sandro Santilli <strk@…>]

In 45d2fc8/git:

Check that ST_ChangeEdgeGeom doesn't change winding of rings

References #5787 in master branch (3.6.0dev)

[Sandro Santilli <strk@…>]

In 6e378cf/git:

Check that ST_ChangeEdgeGeom doesn't change winding of rings

References #5787 in 3.5 branch (3.5.1dev)

[Sandro Santilli <strk@…>]

In 639f030/git:

Check that ST_ChangeEdgeGeom doesn't change winding of rings

References #5787 in 3.4 branch (3.4.4dev)

[Sandro Santilli <strk@…>]

In 8996cdd/git:

Check that ST_ChangeEdgeGeom doesn't change winding of rings

Closes #5787 in 3.3 branch (3.3.8dev)