r/aws_ db_cluster: add read replicate to domain on create

[johnsonaj]

Description

Relations

References

Output from Acceptance Testing

% make testacc PKG=rds TESTS="TestAccRDSInstance_ReplicateSourceDB_mssqlDomain"

make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.7 test ./internal/service/rds/... -v -count 1 -parallel 20 -run='TestAccRDSInstance_ReplicateSourceDB_mssqlDomain'  -timeout 360m
=== RUN   TestAccRDSInstance_ReplicateSourceDB_mssqlDomain
=== PAUSE TestAccRDSInstance_ReplicateSourceDB_mssqlDomain
=== CONT  TestAccRDSInstance_ReplicateSourceDB_mssqlDomain
--- PASS: TestAccRDSInstance_ReplicateSourceDB_mssqlDomain (5167.75s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	5174.387s

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