r/aws_ec2_serial_console_access: Add region argument

[ewbankkit]

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.

Description

Adds the missing region argument.
Requires resource identity schema migration.

As the resource can be imported, the undocumented id attribute changed from the AWS account ID to Region. I did not call this out in the CHANGELOG entry.

Relations

Closes #44250.
Relates #45023.

Output from Acceptance Testing

% make testacc TESTARGS='-run=TestAccEC2SerialConsoleAccess_serial' PKG=ec2   
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
make: Running acceptance tests on branch: 🌿 f-aws_ec2_serial_console_access-add-region 🌿...
TF_ACC=1 go1.24.10 test ./internal/service/ec2/... -v -count 1 -parallel 20  -run=TestAccEC2SerialConsoleAccess_serial -timeout 360m -vet=off
2025/11/13 11:46:11 Creating Terraform AWS Provider (SDKv2-style)...
2025/11/13 11:46:11 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccEC2SerialConsoleAccess_serial
=== PAUSE TestAccEC2SerialConsoleAccess_serial
=== CONT  TestAccEC2SerialConsoleAccess_serial
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource/basic
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource/Identity
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource/Identity/UpgradeNoRefresh
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource/Identity/basic
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource/Identity/ExistingResource
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource/Identity/ExistingResourceNoRefresh
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource/Identity/RegionOverride
=== RUN   TestAccEC2SerialConsoleAccess_serial/Resource/Identity/Upgrade
=== RUN   TestAccEC2SerialConsoleAccess_serial/DataSource
=== RUN   TestAccEC2SerialConsoleAccess_serial/DataSource/basic
--- PASS: TestAccEC2SerialConsoleAccess_serial (304.69s)
    --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource (295.56s)
        --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource/basic (23.56s)
        --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource/Identity (272.00s)
            --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource/Identity/UpgradeNoRefresh (47.66s)
            --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource/Identity/basic (20.13s)
            --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource/Identity/ExistingResource (78.25s)
            --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource/Identity/ExistingResourceNoRefresh (42.83s)
            --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource/Identity/RegionOverride (24.33s)
            --- PASS: TestAccEC2SerialConsoleAccess_serial/Resource/Identity/Upgrade (58.80s)
    --- PASS: TestAccEC2SerialConsoleAccess_serial/DataSource (9.13s)
        --- PASS: TestAccEC2SerialConsoleAccess_serial/DataSource/basic (9.13s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	310.813s

[github-actions]

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[YakDriver]

LGTM 🎉

[github-actions]

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[github-actions]

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