populate_topology_layer does not work as documented

[strk]

This documented function does not do what is expected to do: ​https://postgis.net/docs/manual-3.3/Populate_Topology_Layer.html

It is also lacking a testcase.

The implementation is also source of a WARNING about escaped strings ( #5678 )

[strk]

WIP PR to fix this problem: ​https://git.osgeo.org/gitea/postgis/postgis/pulls/175

[strk]

it turns out the problem is related to #5678 because the function works fine when standard_conforming_strings are off

[strk]

CI showing the problem: ​https://woodie.osgeo.org/repos/30/pipeline/1828/9#L1249

[Sandro Santilli <strk@…>]

In f64b082/git:

Fix populate_topology_layer with conforming strings off

References #5680, #5678 in master branch (3.5.0dev)

Includes test

[Sandro Santilli <strk@…>]

In c3093e5/git:

Fix populate_topology_layer with conforming strings off

References #5680, #5678 in 3.4 branch (3.4.3dev)

Includes test

[Sandro Santilli <strk@…>]

In 71afa3e/git:

Fix populate_topology_layer with conforming strings off

Closes #5680, #5678 in 3.3 branch (3.3.7dev)

Includes test