qa/tests: added ragweed coverage to stress-split* upgrade suites

Fixes: http://tracker.ceph.com/issues/40452
Signed-off-by: Yuri Weinstein <yweinste@redhat.com>

qa/suites/upgrade/mimic-x/stress-split/4-workload/rgw_ragweed_prepare.yaml

@@ -0,0 +1,14 @@
+meta:
+- desc: |
+   rgw ragweed `prepare` before upgrade
+stress-tasks:
+  full_sequential:
+  - sequential:
+    - rgw:
+      - client.0
+    - ragweed:
+        client.1:
+          default-branch: ceph-nautilus
+          rgw_server: client.0
+          stages: prepare
+    - print: "**** done rgw ragweed `prepare` 4-workload"

qa/suites/upgrade/mimic-x/stress-split/7-final-workload/rgw-swift-ragweed_check.yaml

@@ -0,0 +1,18 @@
+meta:
+- desc: |
+   swift api tests for rgw
+   rgw ragweed `check` after upgrade
+tasks:
+- rgw:
+    client.0:
+- print: "**** done rgw 7-workload"
+- swift:
+    client.0:
+      rgw_server: client.0
+- print: "**** done swift 7-workload"
+- ragweed:
+    client.0:
+      default-branch: ceph-nautilus
+      rgw_server: client.0
+      stages: check
+- print: "**** done rgw ragweed `check` 7-workload"