r/aws_pinpointsmsvoicev2_phone_number: Support SHORT_CODE import with creation validation

[naari3]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

No changes to security controls.

Description

This PR fixes the number_type attribute to support SHORT_CODE number types while preventing their creation via Terraform.

Background:
While SHORT_CODE cannot be created via the RequestPhoneNumber API (hence it's not in RequestableNumberType), short codes CAN be provisioned through AWS Support cases. Once provisioned, these resources exist in AWS and can be described via DescribePhoneNumbers API.

Use Case:

• Import existing SHORT_CODE resources created via AWS Support
• Manage attributes (tags, opt-out lists, deletion protection, etc.) of these imported resources
• Ensure drift detection works correctly

Changes:

1. Updated number_type schema from RequestableNumberType to NumberType enum to allow SHORT_CODE values during import and read operations
2. Added validation in Create function to prevent SHORT_CODE creation attempts with a clear, actionable error message directing users to AWS Support
3. Added acceptance test to verify the validation error

Relations

Closes #41697

Output from Acceptance Testing

% make testacc TESTS=TestAccPinpointSMSVoiceV2PhoneNumber_shortCodeCreateValidation PKG=pinpointsmsvoicev2

make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
make: Running acceptance tests on branch: 🌿 b-pinpointsmsvoicev2-phone-number-short-code-validation 🌿...
TF_ACC=1 go1.24.6 test ./internal/service/pinpointsmsvoicev2/... -v -count 1 -parallel 20 -run='TestAccPinpointSMSVoiceV2PhoneNumber_shortCodeCreateValidation'  -timeout 360m -vet=off
2025/10/03 18:27:29 Creating Terraform AWS Provider (SDKv2-style)...
2025/10/03 18:27:29 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccPinpointSMSVoiceV2PhoneNumber_shortCodeCreateValidation
=== PAUSE TestAccPinpointSMSVoiceV2PhoneNumber_shortCodeCreateValidation
=== CONT  TestAccPinpointSMSVoiceV2PhoneNumber_shortCodeCreateValidation
--- PASS: TestAccPinpointSMSVoiceV2PhoneNumber_shortCodeCreateValidation (5.89s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/pinpointsmsvoicev2	11.198s

[github-actions]

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[github-actions]

✅ Thank you for correcting the previously detected issues! The maintainers appreciate your efforts to make the review process as smooth as possible.