Adjust health check Description when BackendConfig used

[DamianSawicki]

This is the first preparatory PR in a series of two. The intention of the second PR is to detect the removal of BackendConfig CRD and to update health check configuration according to the existing input (rather than keep the existing configuration from BackendConfig).

The present PR updates the health check Description when BackendConfig is used. Additionally, test cases are modified to verify health check Descriptions.

[k8s-ci-robot]

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[DamianSawicki]

/assign kl52752

[DamianSawicki]

/cc swetharepakula

[aojea]

/ok-to-test

[kl52752]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DamianSawicki, kl52752

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