feature: [New Data Source]: AWS Organizations descendant OUs

[jordanst3wart]

Description

Implements a new data source for aws organization unit descendants

Relations

Closes: #30992

References

Current data source only includes immediate children:
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/organizations_organizational_units

Output from Acceptance Testing

% make testacc TESTS=TestAccOrganizations_serial PKG=organizations
# fails with environment variables not set

[github-actions]

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[jordanst3wart]

I may need to look more into testing

[github-actions]

Welcome @jordanst3wart 👋

It looks like this is your first Pull Request submission to the Terraform AWS Provider! If you haven’t already done so please make sure you have checked out our CONTRIBUTOR guide and FAQ to make sure your contribution is adhering to best practice and has all the necessary elements in place for a successful approval.

Also take a look at our FAQ which details how we prioritize Pull Requests for inclusion.

Thanks again, and welcome to the community! 😃

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccOrganizations_serial/OrganizationalUnit/DescendantOUsDataSource_basic' PKG=organizations
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.0 test ./internal/service/organizations/... -v -count 1 -parallel 20  -run=TestAccOrganizations_serial/OrganizationalUnit/DescendantOUsDataSource_basic -timeout 360m
=== RUN   TestAccOrganizations_serial
=== PAUSE TestAccOrganizations_serial
=== CONT  TestAccOrganizations_serial
=== RUN   TestAccOrganizations_serial/OrganizationalUnit
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/DescendantOUsDataSource_basic
--- PASS: TestAccOrganizations_serial (16.82s)
    --- PASS: TestAccOrganizations_serial/OrganizationalUnit (16.82s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/DescendantOUsDataSource_basic (16.82s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/organizations	21.651s

[ewbankkit]

@jordanst3wart Thanks for the contribution 🎉 👏.
I renamed to aws_organizations_organizational_unit_descendant_organizational_units.

[github-actions]

This functionality has been released in v5.66.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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