End portal frames no longer suffocate the player since 15w46a

Relates to MC-166718 and MC-203377. Causes MC-311763.

From their introduction up to 15w45a, due to being solid collision, end portal frames would trigger suffocation damage, show a dark screen overlay, and attempt to unintersect the player by pushing them out. Starting with 15w46a, this appears to have been broken, as the aforementioned behaviour no longer happens, and it is treated more akin to standing inside of glass.

I suspect that the fix for MC-3634 may have been responsible for causing this bug, and due to 1.14’s changes to collision shapes, that kind of change is no longer needed - end portal frames can follow normal placement rules while still being fully capable of entity suffocation, as was done for paths and farmland for the fix of MC-166718.

You can use this command to reproduce, noting the lack of pushing or damage: /fill ~ ~ ~ ~ ~1 ~ end_portal_frame