fix: add default organization as query for org v2 list (#8719)

# Which Problems Are Solved

To get the default organization we have no direct solution.

# How the Problems Are Solved

Add default organization as query to the org v2 List.

# Additional Changes

None

# Additional Context

Closes #8616

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

proto/zitadel/org/v2/query.proto

@@ -20,6 +20,7 @@ message SearchQuery {
     OrganizationDomainQuery domain_query = 2;
     OrganizationStateQuery state_query = 3;
     OrganizationIDQuery id_query = 4;
+    DefaultOrganizationQuery default_query = 5;
   }
 }
 
@@ -80,4 +81,6 @@ message OrganizationIDQuery {
 enum OrganizationFieldName {
   ORGANIZATION_FIELD_NAME_UNSPECIFIED = 0;
   ORGANIZATION_FIELD_NAME_NAME = 1;
-}
+}
+
+message DefaultOrganizationQuery {}