Makes check_teleport_valid pure & signal clean up (#90738)

- Closes #90704

The following changes were implemented for this
- Moved sending signals `COMSIG_MOVABLE_TELEPORTING` &
`COMSIG_ATOM_INTERCEPT_TELEPORTING` from `check_teleport_valid` into
`do_teleport`. These 2 signals were causing all the side effects
- Removed signals `COMSIG_ATOM_INTERCEPT_TELEPORTED` &
`COMSIG_MOVABLE_TELEPORTED` as the above 2 signals can do their jobs &
block the teleport if needed so these signals became obsolete
- Removed define `COMPONENT_BLOCK_TELEPORT` in favour of returning a
positive value if teleport was successfully blocked. Having 2 signals
located in 2 separate files use this same define doesn't look great.

🆑
code: cleans up teleportation code. `check_teleport_valid` is now a pure
function with no side effects
/🆑

code/game/objects/effects/blessing.dm

@@ -22,8 +22,8 @@
 	UnregisterSignal(loc, COMSIG_ATOM_INTERCEPT_TELEPORTING)
 	return ..()
 
-/obj/effect/blessing/proc/block_cult_teleport(datum/source, channel, turf/origin, turf/destination)
+/obj/effect/blessing/proc/block_cult_teleport(datum/source, channel, turf/origin)
 	SIGNAL_HANDLER
 
 	if(channel == TELEPORT_CHANNEL_CULT)
-		return COMPONENT_BLOCK_TELEPORT
+		return TRUE