Generate boundaries in splitting algorithm with Polygon Topology

[spwoodcock]

Describe the bug

• The task splitting script does not always produce perfect boundaries, so there is no polygon topology.
  

• Sometimes there are holes or overlaps.

• When editing the geometry in OpenLayers, the boundaries of the neighboring polygon are not edited at the same time, meaning you have to move the boundary twice.

To Reproduce

• Testing via FMTM frontend.

Expected behavior

• The FeatureCollection should be generated with Polygon Topology, to allow for easy editing.

Screenshots

[spwoodcock]

This can be achieved in QGIS by snapping geometries together at the end: https://docs.qgis.org/3.28/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#snap-geometries-to-layer using a very low tolerance value (try 0.00001).