chore: Migrates `federated_settings_org_rolemapping` to the new auto-generated SDK

[EspenAlbert]

Description

Migrates federated_settings_org_rolemapping to the new auto-generated SDK

Link to any related issue(s): CLOUDP-246324

~Waiting on #2258~

Type of change:

• [ ] Bug fix (non-breaking change which fixes an issue). Please, add the "bug" label to the PR.
• [ ] New feature (non-breaking change which adds functionality). Please, add the "enhancement" label to the PR. A migration guide must be created or updated if the new feature will go in a major version.
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected). Please, add the "breaking change" label to the PR. A migration guide must be created or updated.
• [ ] This change requires a documentation update
• [ ] Documentation fix/enhancement

Required Checklist:

• [x] I have signed the MongoDB CLA
• [x] I have read the contributing guides
• [x] I have checked that this change does not generate any credentials and that they are NOT accidentally logged anywhere.
• [x] I have added tests that prove my fix is effective or that my feature works per HashiCorp requirements
• [x] I have added any necessary documentation (if appropriate)
• [x] I have run make fmt and formatted my code
• [x] If changes include deprecations or removals, I defined an isolated PR with a relevant title as it will be used in the auto-generated changelog.
• [x] If changes include removal or addition of 3rd party GitHub actions, I updated our internal document. Reach out to the APIx Integration slack channel to get access to the internal document.

Further comments

Acceptance test:

go test -timeout 2400s -run ^TestAccFederatedSettingsOrgRoleMapping_basic$ github.com/mongodb/terraform-provider-mongodbatlas/internal/service/federatedsettingsorgrolemapping -v

=== RUN   TestAccFederatedSettingsOrgRoleMapping_basic
=== PAUSE TestAccFederatedSettingsOrgRoleMapping_basic
=== CONT  TestAccFederatedSettingsOrgRoleMapping_basic
--- PASS: TestAccFederatedSettingsOrgRoleMapping_basic (16.72s)
PASS
ok      github.com/mongodb/terraform-provider-mongodbatlas/internal/service/federatedsettingsorgrolemapping     17.835s