PolylineGeometry angled strangely when crossing the Prime Meridian

A PolylineGeometry with two positions and `followSurface` set to false gets angled strangely when it cross the Prime Meridian. This goes back at least as far as 1.33.

[Demo](https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/#c=fVNrb9owFP0rEV8aJGbAsfNoKRpitKoEoypVt2mZJpOYYtWxke3A2MR/nwOEBDrNn+7rHN9zr70mylkzuqHKuXUE3ThDqlmegZd9zL1K9u5QCkOYoOqqeROLWKwtaiU1M0wKbYHfY+HYU8MPiTLWIsJzYRR1fYwA9COEMApwy/kAMYx8GADkdWHohzhoObjT9aGHQNcLoiAMUdhs/Y8Vw6CDfOCjDowQxiFqOQh3sRcGwMORB6GltyHkezCCAIe+53V85BekP04aXqnMqFHbc+2Pkm+5VXt/zLp/Do1Uiq8r+9jkhqVmaeP46K+p7fTXnVQZMTZ8wTwhhipG+GC1okQRkVDwMnp6Hn39eTd9mgyejyQLybnczHK1IAm1LAvCNY3FrloCORH8W8JQcqmqW9za+hTLrIL1JbAMl6LLET0IbQqKQnyt/v4iXcLqUIsozVaVJcYoNs/NnrGGKk5StF2Nba/i8qZBiQcLJbN9iVuvB99G4/H0S7Ni3h3MXfmwasO7rjllVm9FslRSyFyXsy9TxVoeWfLGxOv7tex/DtAJFRScpqwBSVP35BalZ4WZTItNHAXMitjEhsBsOPo8gp9uGq1GT5stp/1DCx9ZtpLKOLniLgBtQ7MVt49Kt+d58kYNSLQu7ui1S1AvZWuHpbdx4+JLxw0n4URrm1nknM/Ybxo3+r22rT+DcUlSq3dqXzYn26Jk2e2PD0EAQK9t3fcoIyWfE1Vj/As)

`followSurface : true` works fine and gives a hint as to what's going on above.

Start by opening the linked Sandcastle demo and tracing PolylineGeometry with two positions crossing the Prime Meridian, comparing followSurface=false with true. Confirm the angled result and use the issue's expected straight behavior as the regression target; no source file or test is named.

Written by the indexing model from the issue text.