Remove use of finalizer in PingSource adapter

[lionelvillard]

Problem
The use of finalizers in the PingSource adapter is overkill since updating the internal state cannot fail.

Similar to #4509

Persona:
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Exit Criteria
A measurable (binary) test that would indicate that the problem has been resolved.

Time Estimate (optional):
How many developer-days do you think this may take to resolve?
<1

Additional context (optional)
Add any other context about the feature request here.

[lberk]

If we remove the finalizers we have to make sure the existing finalizers are also removed. This might require a post-install job to ensure.

[zhaojizhuang]

/assign