`terraform validate` does not check for valid JSON in `actions`

[asaba-hashi]

#180 removed validations for JSON in the actions block of rules. The purpose of those validation methods is to be enable checking that those strings are valid JSON as required by the API at the lighter weight terraform validate, rather than relying on a plan or a failed apply. The map version was meant for scope_filters, so not being referenced was a bug.

With an example:

resource "jupiterone_rule" "test" {
  <snip>

  operations = [
    {
      when = jsonencode({
        "type" : "FILTER",
        "specVersion" : 1,
        "condition" : [
          "AND",
          [
            "queries.query0.total",
            "<",
            1000
          ]
        ]
      }),
      actions = [
        jsonencode({
          "targetValue" : "INFO",
          "type" : "SET_PROPERTY",
          "targetProperty" : "alertLevel"
        }),
        jsonencode({
          "type" : "CREATE_ALERT"
        }),
        "{not-a-valid-json:}"
      ]
    }
  ]
}

Prior to this change, terraform validate would fail with:
``
│ Attribute operations[0].actions string value must be valid JSON, got:
│ ["{"targetProperty":"alertLevel","targetValue":"INFO","type":"SET_PROPERTY"}","{"type":"CREATE_ALERT"}","{not-a-valid-json:}"]

After this change, `terraform validate` will pass, and may not fail until an `apply`, which is not a user-friendly.

[asaba-hashi]

It looks the full testacc is not being executed in CI, the following error is being reported in the tests:

=== CONT  TestRuleInstance_Config_Errors
    resource_rule_test.go:201: Step 2/4, expected an error with pattern, no match on: Error running apply: exit status 1
        
        Error: failed to build rule from configuration
        
          with jupiterone_rule.test,
          on terraform_plugin_test.tf line 2, in resource "jupiterone_rule" "test":
           2:           resource "jupiterone_rule" "test" {
        
        invalid character 'o' in literal null (expecting 'u')
--- FAIL: TestRuleInstance_Config_Errors (0.29s)