[FEM] Transform constraint polish

[donovaly]

• make the angles a PropertyAngle to handle the unit
• also fix some too long code lines

[freecadci]

for feature branch PR_9087. Pipeline 819372174 was triggered at ecaf377. All CI branches and pipelines.

[freecadci]

for feature branch PR_9087. Pipeline 819442333 was triggered at 49eba33. All CI branches and pipelines.

[freecadci]

for feature branch PR_9087. Pipeline 819626828 was triggered at e2ea708. All CI branches and pipelines.

[freecadci]

for feature branch PR_9087. Pipeline 819662172 was triggered at 3bdc6e1. All CI branches and pipelines.