Add support for dynamically defining the elements in the ProbeFields

[JoaoBraveCoding]

Request/Feature

Support for dynamically defining the ProbeFields on a per placement or managed cluster basis.

Use case

The observability group continues to develop the MultiClusterObservabilityAddon (MCOA), this addon has the ability to selectively deploy different observability signals collectors to different spoke clusters. Some observability deployment can be rather complex so we would want the ability to let users know if their deployments have been successful. To achieve this we started using the AgentHealthProber of type HealthProberTypeWork. Unfortunately this probe only supports a fixed list of ProbeFields which is not sufficient for our use case given some clusters might just want metrics while others might want metrics and logs.

[zhiweiyin318]

This requirement is similar with #287
I have a PR #289 to address this.
In the PR, support wildcard in the name and namespace of ProbeField.ResourceIdentifier (depend on this open-cluster-management-io/ocm#705), and add another func HealthChecker to WorkHealthProber which can check all feedback results at once.
@JoaoBraveCoding could you help check if this can address your case?

[JoaoBraveCoding]

@zhiweiyin318 thank you for the quick work! I've already drafted a PR and tested this and it seems to do the job! I'll double check with the team to be sure 👍 Great work! 🙌