[Bug] Import-records fix when importing from older InvenTree+Postgres version (#10862)

* Fixed issue where importing data from older versions of InvenTree+Postgres would fail

* Update tasks.py

Changed .startswith to exact matching for users.userprofile.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update tasks.py

Added validation checks to user primary key pairing dict.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Reverted tasks.py, disabled signals in user model when importing data

---------

Co-authored-by: Oliver <oliver.henry.walters@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/backend/InvenTree/users/models.py

@@ -600,6 +600,10 @@ class UserProfile(InvenTree.models.MetadataMixin):
 @receiver(post_save, sender=User)
 def create_or_update_user_profile(sender, instance, created, **kwargs):
     """Create or update user profile when user is saved."""
+    # Disable profile creation if importing data from file
+    if isImportingData():
+        return
+
     if created:
         UserProfile.objects.create(user=instance)
     instance.profile.save()
@@ -629,6 +633,10 @@ def validate_primary_group_on_delete(sender, instance, **kwargs):
 @receiver(m2m_changed, sender=User.groups.through)
 def validate_primary_group_on_group_change(sender, instance, action, **kwargs):
     """Validate primary_group on user profiles when a group is added or removed."""
+    # Disable user profile validation if importing data from file
+    if isImportingData():
+        return
+
     if action in ['post_add', 'post_remove']:
         profile = instance.profile
         if profile.primary_group and profile.primary_group not in instance.groups.all():