add path.repo to KNN for 2.20 and 3.0.0-alpha1 (#5387)

Signed-off-by: AnnTian Shao <anntians@amazon.com>
Co-authored-by: AnnTian Shao <anntians@amazon.com>

Author: anntians

manifests/2.20.0/opensearch-2.20.0-test.yml

@@ -77,6 +77,9 @@ components:
       test-configs:
         - with-security
         - without-security
+      additional-cluster-configs:
+        path.repo:
+          - /tmp
   - name: ml-commons
     integ-test:
       test-configs:

manifests/3.0.0-alpha1/opensearch-3.0.0-alpha1-test.yml

@@ -83,6 +83,9 @@ components:
       test-configs:
         - with-security
         - without-security
+      additional-cluster-configs:
+        path.repo:
+          - /tmp
     smoke-test:
       test-spec: k-NN.yml
   - name: ml-commons