fix(manager): switch sanity tests to run on multiDC cluster

Sanity tests on debian11, ubuntu22 and ubuntu24 switched to be run on
multiDC cluster.

This configuration was already in place some time ago before issue
scylladb/scylla-manager#3871 was found.
After that Manager jobs were switched to run only on singleDC cluster
(scylladb#7435).

And since the fix for Manager is ready now, multiDC setup can be brought
back.

jenkins-pipelines/manager/debian11-manager-sanity.jenkinsfile

@@ -5,9 +5,9 @@ def lib = library identifier: 'sct@snapshot', retriever: legacySCM(scm)
 
 managerPipeline(
     backend: 'aws',
-    region: 'us-east-1',
+    region:  '''["us-east-1", "us-west-2"]''',
     test_name: 'mgmt_cli_test.MgmtCliTest.test_manager_sanity',
-    test_config: '''["test-cases/manager/manager-regression-singleDC-set-distro.yaml", "configurations/manager/debian11.yaml"]''',
+    test_config: '''["test-cases/manager/manager-regression-multiDC-set-distro.yaml", "configurations/manager/debian11.yaml"]''',
 
     post_behavior_db_nodes: 'destroy',
     post_behavior_loader_nodes: 'destroy',

jenkins-pipelines/manager/ubuntu22-manager-sanity.jenkinsfile

@@ -5,9 +5,9 @@ def lib = library identifier: 'sct@snapshot', retriever: legacySCM(scm)
 
 managerPipeline(
     backend: 'aws',
-    region: 'us-east-1',
+    region:  '''["us-east-1", "us-west-2"]''',
     test_name: 'mgmt_cli_test.MgmtCliTest.test_manager_sanity',
-    test_config: 'test-cases/manager/manager-regression-singleDC-set-distro.yaml',
+    test_config: 'test-cases/manager/manager-regression-multiDC-set-distro.yaml',
 
     post_behavior_db_nodes: 'destroy',
     post_behavior_loader_nodes: 'destroy',

jenkins-pipelines/manager/ubuntu24-manager-sanity.jenkinsfile

@@ -5,9 +5,9 @@ def lib = library identifier: 'sct@snapshot', retriever: legacySCM(scm)
 
 managerPipeline(
     backend: 'aws',
-    region: 'us-east-1',
+    region:  '''["us-east-1", "us-west-2"]''',
     test_name: 'mgmt_cli_test.MgmtCliTest.test_manager_sanity',
-    test_config: '''["test-cases/manager/manager-regression-singleDC-set-distro.yaml", "configurations/manager/ubuntu24.yaml"]''',
+    test_config: '''["test-cases/manager/manager-regression-multiDC-set-distro.yaml", "configurations/manager/ubuntu24.yaml"]''',
 
     post_behavior_db_nodes: 'destroy',
     post_behavior_loader_nodes: 'destroy',