feat: Add public_key_wo write only attr for aws_key_pair resource

[rhariady]

Rollback Plan

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

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

No

Description

Add 2 new optionals attribute for aws_key_pair resource.

• public_key_wo (write only)
• public_key_wo_version

Only one of public_key or public_key_wo can be set, and this is ensured by using the ExactlyOneOf parameter.

Relations

Closes #41922

References

Output from Acceptance Testing

% make testacc TESTS=TestAccEC2KeyPair_basic PKG=ec2
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.6 test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccEC2KeyPair_basic'  -timeout 360m -vet=off
2025/09/01 14:40:44 Creating Terraform AWS Provider (SDKv2-style)...
2025/09/01 14:40:44 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccEC2KeyPair_basic
=== PAUSE TestAccEC2KeyPair_basic
=== CONT  TestAccEC2KeyPair_basic
--- PASS: TestAccEC2KeyPair_basic (21.47s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ec2        21.735s


% make testacc TESTS=TestAccEC2KeyPair_writeOnly PKG=ec2
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.6 test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccEC2KeyPair_writeOnly'  -timeout 360m -vet=off
2025/09/01 14:18:22 Creating Terraform AWS Provider (SDKv2-style)...
2025/09/01 14:18:22 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccEC2KeyPair_writeOnly
=== PAUSE TestAccEC2KeyPair_writeOnly
=== CONT  TestAccEC2KeyPair_writeOnly
--- PASS: TestAccEC2KeyPair_writeOnly (23.61s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ec2        23.900s
...

[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.