[AMBARI-24158] Provide a way to disable topology validation in cluster creation request

[adoroszlai]

What changes were proposed in this pull request?

Allow passing ?validate_topology=false in the cluster creation request to disable topology validation.

https://issues.apache.org/jira/browse/AMBARI-24158

How was this patch tested?

1. Tested with invalid blueprint:

   Submitted cluster creation request for a blueprint with invalid topology (HDFS components except NAMENODE).

   Result with validation:

   { "status" : 400, "message" : "Topology validation failed: org.apache.ambari.server.topology.InvalidTopologyException: Cluster Topology validation failed. Invalid service component count: [Component{name=NAMENODE, mpack_instance=null, service_instance=null, provision_action=INSTALL_AND_START} (actual=0, expected=1-2)]. To disable topology validation and create the blueprint, add the following to the end of the url: '?validate_topology=false'" }
   

   Result With validation disabled:

   { "Requests" : { "id" : 1, "status" : "Accepted" } }
   

   (Of course cluster creation fails later.)

2. Tested with a valid blueprint that triggers auto-deployment of some client component. Verified that the client was not added when validate_topology=false was included.

3. Tested without specifying validate_topology. Verified that validation is performed by default.

[asfgit]

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Test FAILed.
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