[BUG] Compatibility issue with plugins about class 'org.opensearch.action.support.master.AcknowledgedResponse'

[tlfeng]

Describe the bug
Similar issue: #3683 and #3688
Introduced by PR #3593 / commit 223d472, which aims to resolve issue #3542

The change of class org.opensearch.action.support.master.AcknowledgedResponse causes compatibility issue with plugins that uses this class.

For example:
This is the code in security that causes build failure:
https://github.com/opensearch-project/security/blob/f431ec2201e1466b7c12528347a1f54cf64387c9/src/main/java/org/opensearch/security/tools/SecurityAdmin.java#L518

The problem is the variable definition is in type of a subclass, while an object in superclass is assigned to the variable.

The current AcknowledgedResponse in master package extends the same name class in clustermanager class
https://github.com/opensearch-project/OpenSearch/blob/223d472e6d8ea4454cb05fba7271d213430a1a4e/server/src/main/java/org/opensearch/action/support/master/AcknowledgedResponse.java
In the meantime, I changed the return value type of "putSettings" method to the class in "cluster manager" package.
While security plugin is using the AcknowledgedResponse class in master package.

To Reproduce

1. Build OpenSearch 2.1.0 Snapshot using the code https://github.com/opensearch-project/OpenSearch/tree/79cabafebc74e8379f7c854657693ca3b03a3247
2. Build security plugin or k-NN plugin with the above OpenSearch build artifact.
3. Plugins can't be built.

Expected behavior
The current plugins can be built correctly without making name change to OpenSearch Java API.

Additional context
A build failure in CCR plugin (comes from opensearch-project/cross-cluster-replication#398):
/home/runner/work/cross-cluster-replication/cross-cluster-replication/src/main/kotlin/org/opensearch/replication/action/autofollow/TransportAutoFollowClusterManagerNodeAction.kt: (48, 1): Class 'TransportAutoFollowClusterManagerNodeAction' is not abstract and does not implement abstract base class member protected/*protected and package*/ abstract fun clusterManagerOperation(p0: AutoFollowClusterManagerNodeRequest!, p1: ClusterState!, p2: ActionListener<AcknowledgedResponse!>!): Unit defined in org.opensearch.action.support.master.TransportMasterNodeAction

Solution:
Restore the change for this class to keep the compatibility.

To restore the class org.opensearch.action.support.master.AcknowledgedResponse to its original appearance (https://github.com/opensearch-project/OpenSearch/blob/2.0.1/server/src/main/java/org/opensearch/action/support/master/AcknowledgedResponse.java)
I need to do in 2 PRs to keep the git history of the file:

1. Remove the current class AcknowledgedResponse from package org.opensearch.action.support.master
2. Move the class AcknowledgedResponse from package org.opensearch.action.support.clustermanager to org.opensearch.action.support.master (https://github.com/opensearch-project/OpenSearch/blob/7005b9eb42f66912507b8f973b79734c260bdfe9/server/src/main/java/org/opensearch/action/support/clustermanager/AcknowledgedResponse.java)

[tlfeng]

The problem will be resolved for now after the backport PR #3670 merged.
I will think of the correct way to deal with the class AcknowledgedResponse and related classes.