fix FowardingAndOthers test

[jafowler]

This aims to fix the FowardingAndOthers Acceptance test.

=== RUN   TestAccCloudflarePageRule_ForwardingAndOthers
--- PASS: TestAccCloudflarePageRule_ForwardingAndOthers (1.46s)
PASS
ok      github.com/cloudflare/terraform-provider-cloudflare/internal/services/page_rule 4.233s

Terraform does some weird things with the API output, but essentially it makes it a multi line object with various unnecessary whitespace causing issues with regexp.

  error=
  | exit status 1
  |
  | Error: failed to make http request
  |
  |   with cloudflare_page_rule.nkcfpuwhfo,
  |   on terraform_plugin_test.tf line 12, in resource "cloudflare_page_rule" "nkcfpuwhfo":
  |   12: resource "cloudflare_page_rule" "nkcfpuwhfo" {
  |
  | POST
  | "https://api.cloudflare.com/client/v4/zones/0da42c8d2132a9ddaf714f9e7c920711/pagerules":
  | 400 Bad Request {"success":false,"errors":[{"code":1004,"message":"Page Rule
  | validation failed: See messages for
  | details."}],"messages":[{"code":1,"message":".settings: \"forwarding_url\"
  | may not be used with \"any setting\"","type":null}],"result":null}

[mgirouard]

lgtm