fix: use unique target resource in SSA e2e test

Avoid conflict with other tests that use the same targetResource by
using a dedicated API group for the SSA test.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: scotwells

test/e2e/server-side-apply/chainsaw-test.yaml

@@ -27,7 +27,7 @@ spec:
                 name: test-ssa-policy
               spec:
                 targetResource:
-                  group: "contacts.miloapis.com"
+                  group: "ssa-test.miloapis.com"
                   version: v1
                   kind: Contact
                 conditions:
@@ -53,7 +53,7 @@ spec:
                 name: test-ssa-policy
               spec:
                 targetResource:
-                  group: "contacts.miloapis.com"
+                  group: "ssa-test.miloapis.com"
                   version: v1
                   kind: Contact
                 fields:
@@ -77,7 +77,7 @@ spec:
                 name: test-ssa-policy
               spec:
                 targetResource:
-                  group: "contacts.miloapis.com"
+                  group: "ssa-test.miloapis.com"
                   version: v1
                   kind: Contact
                 conditions: