chore(docdb): upgrade integ tests to engine 8.0.0 and add serverless region constraints

[aemada-aws]

Issue # (if applicable)

N/A

Reason for this change

Four aws-docdb integration tests were failing due to region-incompatible engine versions:

• integ.cluster / integ.cluster-copy-tags-to-snapshot / integ.cluster-removal-policy-snapshot: Used DocumentDB engine version 3.6.0, which is not available in all regions (e.g., eu-north-1 only supports 4.0.0+). Errors:
  • Resource handler returned message: "Internal Failure"
  • Cannot find version 3.6.0 for docdb
• integ.cluster-serverless: DocumentDB Serverless (db.serverless) is not available in all regions (e.g., eu-north-1). Error:
  • The request includes a Serverless v2 ScalingConfiguration attribute, which isn't available for the engine version of your cluster (5.0.0)

Additionally, DocumentDB 3.6.0 standard support ends March 30, 2026, making the version upgrade timely.

Description of changes

Provisioned cluster tests (integ.cluster, integ.cluster-copy-tags-to-snapshot, integ.cluster-removal-policy-snapshot):

• Upgraded engine version from 3.6.0 → 8.0.0 (latest, available in all DocDB regions)
• Updated parameter group family from docdb3.6 → docdb8.0
• No region constraints needed — 8.0.0 is universally available
• Added IntegTest wrapper to integ.cluster.ts (previously used bare app.synth())

Serverless test (integ.cluster-serverless):

• Added region constraints via IntegTest.regions (serverless only supports 5.0.0 and is not available in eu-north-1)

New shared constants file (docdb-integ-test-constraints.ts):

• DOCDB_ENGINE_VERSION / DOCDB_PARAMETER_GROUP_FAMILY for provisioned tests
• DOCDB_SERVERLESS_ENGINE_VERSION / DOCDB_SERVERLESS_SUPPORTED_REGIONS for serverless test
• Includes verification commands in comments

Describe any new or updated permissions being added

N/A

Description of how you validated changes

All 4 tests deployed and destroyed successfully:

cd packages/@aws-cdk-testing/framework-integ && yarn integ \
  test/aws-docdb/test/integ.cluster.js \
  test/aws-docdb/test/integ.cluster-copy-tags-to-snapshot.js \
  test/aws-docdb/test/integ.cluster-removal-policy-snapshot.js \
  test/aws-docdb/test/integ.cluster-serverless.js \
  --disable-update-workflow \
  --update-on-failed \
  --force \
  --parallel-regions us-east-1 \
  --parallel-regions us-east-2 \
  --parallel-regions us-west-2 \
  --parallel-regions eu-west-1 \
  --verbose

Results: Tests: 4 passed, 4 total

⚠️ Destructive changes expected: Engine version upgrade from 3.6.0 to 8.0.0 requires cluster replacement. This is intentional.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[github-actions]

⚠️ Experimental Feature: This security report is currently in experimental phase. Results may include false positives and the rules are being actively refined.
Please try merge from main to avoid findings unrelated to the PR.

---

	Tests	Passed ✅	Skipped	Failed
Security Guardian Results	96 ran	96 passed

Test	Result
No test annotations available

• View Security Guardian Results

[github-actions]

⚠️ Experimental Feature: This security report is currently in experimental phase. Results may include false positives and the rules are being actively refined.
Please try merge from main to avoid findings unrelated to the PR.

---

	Tests	Passed ✅	Skipped	Failed
Security Guardian Results with resolved templates	96 ran	96 passed

Test	Result
No test annotations available

• View Security Guardian Results with resolved templates