[PLAT-20054] Remove stale postgres-upgrade init container references

Summary:
The tianon/postgres-upgrade:11-to-14 init container was already removed
from the statefulset, but two orphaned references remained: a resource
block in values.yaml and a unit test asserting on the now-absent
container. Drop both.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Test Plan: phabricator-test

Reviewers: dshubin

Reviewed By: dshubin

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D52953

Author: amannijhawan

stable/yugaware/tests/test_resources.yaml

@@ -32,9 +32,3 @@ tests:
   asserts:
   - isNotEmpty:
       path: spec.template.spec.initContainers[?(@.name == "prometheus-configuration")].resources.requests
-
-- it: Postgres-upgrade initContainer
-  template: statefulset.yaml
-  asserts:
-  - isNotEmpty:
-      path: spec.template.spec.initContainers[?(@.name == "postgres-upgrade")].resources.requests

stable/yugaware/values.yaml

@@ -503,12 +503,6 @@ initContainers:
         cpu: "0.25"
         memory: 500Mi
 
-  postgresUpgrade:
-    resources:
-      requests:
-        cpu: "0.5"
-        memory: 500Mi
-
   dbInit:
     resources:
       requests: