Add support to OSB for serverless OpenSearch implementations

[gkamat]

Is your feature request related to a problem? Please describe.

Serverless OpenSearch implementations don't support the full complement of OpenSearch APIs, since details of the internals such as node counts, allocation, shard locations, etc. are abstracted away. For instance, the cluster-health API may not be available. OSB will not start a test if the health check fails.

Describe the solution you'd like

Enhance OSB to add support for serverless OpenSearch implementations.

A clear and concise description of what you want to happen.

Changes will need to bypass the cluster health check in favor of some other test. In addition, features like telemetry and node stats will likely not be available and will need to be handled appropriately.

[IanHoang]

This has been implemented into OSB 1.1.0