d/aws_account_account: new data source

[alexbacchin]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.
No

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.
No

Description

This data source returns the GetAccountInformation action from AWS Account Management API. Mostly focus on returning the account_name attribute

Relations

Closes #42386

References

References

https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/account#Client.GetAccountInformation

Output from Acceptance Testing

% make testacc TESTS=TestAccAccount_serial PKG=account 
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.6 test ./internal/service/account/... -v -count 1 -parallel 20 -run='TestAccAccount_serial'  -timeout 360m -vet=off
2025/08/29 22:23:30 Creating Terraform AWS Provider (SDKv2-style)...
2025/08/29 22:23:30 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccAccount_serial
=== PAUSE TestAccAccount_serial
=== CONT  TestAccAccount_serial
=== RUN   TestAccAccount_serial/Account
=== RUN   TestAccAccount_serial/Account/dataSourceBasic
=== RUN   TestAccAccount_serial/Account/dataSourceAccountID
=== RUN   TestAccAccount_serial/AlternateContact
=== RUN   TestAccAccount_serial/AlternateContact/basic
=== RUN   TestAccAccount_serial/AlternateContact/disappears
=== RUN   TestAccAccount_serial/AlternateContact/AccountID
=== RUN   TestAccAccount_serial/PrimaryContact
=== RUN   TestAccAccount_serial/PrimaryContact/basic
=== RUN   TestAccAccount_serial/PrimaryContact/dataSourceBasic
=== RUN   TestAccAccount_serial/PrimaryContact/dataSourceAccountID
=== RUN   TestAccAccount_serial/Region
=== RUN   TestAccAccount_serial/Region/basic
=== RUN   TestAccAccount_serial/Region/AccountID
--- PASS: TestAccAccount_serial (934.10s)
    --- PASS: TestAccAccount_serial/Account (38.66s)
        --- PASS: TestAccAccount_serial/Account/dataSourceBasic (14.42s)
        --- PASS: TestAccAccount_serial/Account/dataSourceAccountID (24.24s)
    --- PASS: TestAccAccount_serial/AlternateContact (103.40s)
        --- PASS: TestAccAccount_serial/AlternateContact/basic (31.76s)
        --- PASS: TestAccAccount_serial/AlternateContact/disappears (18.35s)
        --- PASS: TestAccAccount_serial/AlternateContact/AccountID (53.29s)
    --- PASS: TestAccAccount_serial/PrimaryContact (73.36s)
        --- PASS: TestAccAccount_serial/PrimaryContact/basic (29.38s)
        --- PASS: TestAccAccount_serial/PrimaryContact/dataSourceBasic (16.22s)
        --- PASS: TestAccAccount_serial/PrimaryContact/dataSourceAccountID (27.76s)
    --- PASS: TestAccAccount_serial/Region (718.69s)
        --- PASS: TestAccAccount_serial/Region/basic (362.44s)
        --- PASS: TestAccAccount_serial/Region/AccountID (356.26s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/account    937.701s

...

[github-actions]

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