Chore!: fix lvs datasource unexpected changes and resource Known After Apply differences.

[IsaacCalligeros95]

This fixes the following two issues found in testing:

Fixes [] => null on templates and "" -> null on display settings.

Changes to Outputs:
  ~ lvs  = {
      ~ id                    = "Library Variables Sets 2024-08-15 02:14:22.495669 +0000 UTC" -> "Library Variables Sets 2024-08-15 02:23:27.676669 +0000 UTC"
      ~ library_variable_sets = [
          ~ {
                id              = "LibraryVariableSets-81"
                name            = "Another Variable Set"
              ~ template        = [] -> null
                # (4 unchanged attributes hidden)
            },
        ]
        # (6 unchanged attributes hidden)
    }
  ~ sms  = {
      ~ id                    = "Library Variables Sets 2024-08-15 02:14:22.498898 +0000 UTC" -> "Library Variables Sets 2024-08-15 02:23:27.675886 +0000 UTC"
      ~ library_variable_sets = [
          ~ {
                id              = "LibraryVariableSets-82"
                name            = "Hello"
              ~ template        = [] -> null
                # (4 unchanged attributes hidden)
            },
        ]
        # (6 unchanged attributes hidden)
    }

Unexpected changes, only display_settings has been changed.

  # octopusdeploy_library_variable_set.newvariableset will be updated in-place
  ~ resource "octopusdeploy_library_variable_set" "newvariableset" {
      ~ id              = "LibraryVariableSets-85" -> (known after apply)
        name            = "Library Variable Set test (OK to Delete)"
      ~ space_id        = "Spaces-1" -> (known after apply)
      ~ template_ids    = {
          - "AnotherTemplate" = "234c7e65-a1eb-4d77-94e3-eb231e2978ac"
          - "TheTemplate"     = "687ed66c-ea94-42ce-9348-753112a3c730"
        } -> (known after apply)
      ~ variable_set_id = "variableset-LibraryVariableSets-85" -> (known after apply)
        # (1 unchanged attribute hidden)

      ~ template {
          ~ display_settings = {
              ~ "Octopus.ControlType" = "Sensitive" -> "SingleLineText"
            }
            id               = "687ed66c-ea94-42ce-9348-753112a3c730"
            name             = "TheTemplate"
            # (3 unchanged attributes hidden)
        }

        # (1 unchanged block hidden)
    }

Plan: 0 to add, 1 to change, 0 to destroy.

[IsaacCalligeros95]

These changes match the util.schema class. It'd be nice to fully consolidate these two files now that things have settled.

[hnrkndrssn]

LGTM 👍

[IsaacCalligeros95]

@hnrkndrssn I had to remove the UseStateForUnknown from Template Ids change so that still shows Known After Apply. This is a change of behaviour from the previous provider but required by the framework.