MM-57084: Use cache for GetAllProfiles (#26391)

UserStore.GetAllProfiles is a very frequent call. We cache it
when there are no options passed which is the default case.

https://mattermost.atlassian.net/browse/MM-57084

```release-note
NONE
```

server/channels/app/user.go

@@ -263,9 +263,15 @@ func (a *App) createUserOrGuest(c request.CTX, user *model.User, guest bool) (*m
 		}
 	}
 
-	if user.EmailVerified {
-		a.InvalidateCacheForUser(ruser.Id)
+	// We always invalidate the user because we actually need to invalidate
+	// in case the user's EmailVerified is true, but we also always need to invalidate
+	// the GetAllProfiles cache.
+	// To have a proper fix would mean duplicating the invalidation of GetAllProfiles
+	// everywhere else. Therefore, to keep things simple we always invalidate both caches here.
+	// The performance penalty for invalidating the UserById cache is nil because the user was just created.
+	a.InvalidateCacheForUser(ruser.Id)
 
+	if user.EmailVerified {
 		nUser, err := a.ch.srv.userService.GetUser(ruser.Id)
 		if err != nil {
 			var nfErr *store.ErrNotFound