highway-almost-junction: avoid warnings on the intersecting node in P-shaped ways

[Famlam]

Currently analyser osmosis-highway-almost-junction also gives warnings about ways close to the intersecting node of P-shaped ways. This is usually incorrect.

Examples:

• https://www.openstreetmap.org/way/378767305
• https://www.openstreetmap.org/way/135973444
• https://www.openstreetmap.org/way/444296383
• https://www.openstreetmap.org/way/109890813

This PR disables the warning for the intersecting node.

Note: I didn't use ST_IsSimple, since this also caused a lot of false negatives for the other end node. Example

Also adds test cases