Backport of NestingSingle blocks can be null into v1.3 #32498
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Backport
This PR is auto-generated from #32463 to be assessed for backporting due to the inclusion of the label 1.3-backport.
The below text is copied from the body of the original PR.
NestingSingle blocks removed from from the config were causing a plan to error out with "... planned for existence but config wants absence". Terraform core was proposing an incorrect value in this case, taking the prior instead as a fallback because a null value was not expected.
Unlike other collection nesting modes, a NestingSingle block not present in the configuration is a null value, and should be allowed when planning a new value rather than building an empty object or falling back to the prior value.
Fixes #32460