Remove Framework-specific Implementation Details from Plan Modifiers

[bendbennett]

Background

Currently, the schema relating to plan modifiers allows the following:

    "schema_<TYPE>_plan_modifier": {
      "type": "object",
      "properties": {
        "custom": {
          "$ref": "#/$defs/schema_custom_plan_modifier"
        },
        "requires_replace": {
          "type": "object",
          "additionalProperties": false
        },
        "use_state_for_unknown": {
          "type": "object",
          "additionalProperties": false
        }
      },
      "oneOf": [
        {
          "required": [
            "custom"
          ]
        },
        {
          "required": [
            "requires_replace"
          ]
        },
        {
          "required": [
            "use_state_for_unknown"
          ]
        }
      ]
    },

Both requires_replace, and use_state_for_unknown are implementation details that are specific to the framework.

Proposal

Both requires_replace, and use_state_for_unknown should be removed from the schema.

Further Considerations

We could consider adding Terraform-specific behaviours as their own properties (e.g., "does not change on update").

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