Fixes pirates and starfury assailants transferring minds (#73833)

## About The Pull Request

Same issue as before, these skipped the spawn step and snowflaked their
own creation process.

So I split off the create part of attack ghost so these could share.

Fixes #73823 , may fix also #73822 but I don't *think* it will, whatever
changed spawners a few months ago is a little sus

## Why It's Good For The Game

Changeling pirate bad

## Changelog

🆑 Melbert
fix: Fixes pirates and starfury assailants keeping minds of past lives
/🆑

code/modules/mob_spawn/mob_spawn.dm

@@ -175,6 +175,18 @@
 	if(QDELETED(src) || QDELETED(user))
 		return
 
+	create_from_ghost(user)
+
+/**
+ * Uses a use and creates a mob from a passed ghost
+ *
+ * Does NOT validate that the spawn is possible or valid - assumes this has been done already!
+ *
+ * If you are manually forcing a player into this mob spawn,
+ * you should be using this and not directly calling [proc/create].
+ */
+/obj/effect/mob_spawn/ghost_role/proc/create_from_ghost(mob/dead/user)
+	ASSERT(istype(user))
 	user.log_message("became a [prompt_name].", LOG_GAME)
 	uses -= 1 // Remove a use before trying to spawn to prevent strangeness like the spawner trying to spawn more mobs than it should be able to
 	user.mind = null // dissassociate mind, don't let it follow us to the next life