PF previews do not display removed computed properties in previews

[VenelinMartinov]

When removing a property which contains a Computed field, we do not display the Computed field at all:

     ~ testprovider:index/test:Test: (update)
        [id=test-id]
        [urn=urn:pulumi:test::project::testprovider:index/test:Test::p]
      ~ keys: [
          - [0]: {
                  - nested: "value"
                  }
         ]

versus TF:

  ~ resource "testprovider_test" "res" {
        id = "test-id"
      - key {
          - computed = "computed-value" -> null
          - nested   = "value" -> null
        }
    }

See TestDetailedDiffSet/block_with_computed_no_state_for_unknown/removed

[pulumi-bot]

This issue has been addressed in PR #2629 and shipped in release v3.97.0.