chore: fix nat rule type no_snat and no_dnat

[dmicheneau]

Description of your changes

If you submit change in the provider code, please make sure to:

• Write or modify examples in examples/ directory
• Write or modify acceptance tests
• Run make generate to ensure the doc was updated properly

How has this code been tested

Resource
--- PASS: TestAccEdgeGatewayNATRuleResource (1238.85s)
PASS
ok      github.com/orange-cloudavenue/terraform-provider-cloudavenue/internal/testsacc  1239.402s

Datasource
--- PASS: TestAccEdgeGatewayNATRuleDataSource (331.23s)
PASS
ok      github.com/orange-cloudavenue/terraform-provider-cloudavenue/internal/testsacc  331.727s

[azrod]

Great testacc refacto 👍 👍

There are still some points to correct :

• Missing a changelog.
• Missing a testacc result in the PR description.
• Fix your commit message and PR title.
• Missing testacc entry in global setting
  • (https://github.com/orange-cloudavenue/terraform-provider-cloudavenue/blob/main/internal/testsacc/acctest_resources_test.go)
  • (https://github.com/orange-cloudavenue/terraform-provider-cloudavenue/blob/main/internal/testsacc/acctest_datasources_test.go)