Use cascade delete in fragments table

- Add Liquibase change to cascade delete fragments
- Remove cascade delete logic from FragmentNativeRepository
- Remove unused method deleteFragmentEntity

Issue-ID: CPS-1617
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: Iecf4f3022b402e0328609ddc11a879c83e5d7f30
diff --git a/cps-ri/src/main/resources/changelog/changelog-master.yaml b/cps-ri/src/main/resources/changelog/changelog-master.yaml
index 43a54ca..bf172d8 100644
--- a/cps-ri/src/main/resources/changelog/changelog-master.yaml
+++ b/cps-ri/src/main/resources/changelog/changelog-master.yaml
@@ -50,3 +50,5 @@
       file: changelog/db/changes/16-insert-cm-handle-state.yaml
   - include:
       file: changelog/db/changes/17-add-index-to-schema-set-yang-resources.yaml
+  - include:
+      file: changelog/db/changes/18-cascade-delete-fragment-children.yaml