feat(project_management): Add tickets to ProjectMilestone _urls and filtered to milestone

ref: #1190 #337

Author: jon-nfc

app/core/tests/unit/ticket_base/test_unit_ticket_base_viewset.py

@@ -58,6 +58,7 @@ def parameterized_class_attributes(self):
             'filterset_fields': {
                 'value': [
                     'is_deleted',
+                    'milestone',
                     'organization',
                     'project',
                 ]

app/project_management/serializers/project_milestone.py

@@ -1,5 +1,6 @@
 from rest_framework import serializers
 from rest_framework.fields import empty
+from rest_framework.reverse import reverse
 
 from access.serializers.organization import TenantBaseSerializer
 
@@ -52,6 +53,26 @@ class ProjectMilestoneModelSerializer(
 ):
 
 
+    def get_url(self, item) -> dict:
+
+        get_url = super().get_url( item = item )
+
+        get_url.update({
+            'tickets': reverse(
+                viewname = "v2:_api_project_ticket_sub-list",
+                request = None,
+                kwargs={
+                    'project_id': item.project.pk,
+                    'model_name': 'ticketbase'
+                },
+            ) + f'?milestone={item.pk}',
+        })
+
+
+        return get_url
+
+
+
     class Meta:
 
         model = ProjectMilestone