ecs/iso: Fix describe with configuration

[YakDriver]

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Relates #22532
Closes #23342

Output from acceptance testing (us-west-2):

% make testacc TESTS=TestAccECSCluster_ PKG=ecs TESTARGS=-short
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecs/... -v -count 1 -parallel 20 -run='TestAccECSCluster_' -short -timeout 180m
--- PASS: TestAccECSCluster_disappears (29.55s)
--- PASS: TestAccECSCluster_basic (34.73s)
--- PASS: TestAccECSCluster_capacityProviders (48.55s)
--- PASS: TestAccECSCluster_tags (55.15s)
--- PASS: TestAccECSCluster_configuration (56.29s)
--- PASS: TestAccECSCluster_capacityProvidersNoStrategy (62.52s)
--- PASS: TestAccECSCluster_singleCapacityProvider (66.22s)
--- PASS: TestAccECSCluster_containerInsights (74.17s)
--- PASS: TestAccECSCluster_capacityProvidersUpdate (82.84s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecs	84.370s

Output from acceptance testing (GovCloud):

% make testacc TESTS=TestAccECSCluster_ PKG=ecs TESTARGS=-short
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecs/... -v -count 1 -parallel 20 -run='TestAccECSCluster_' -short -timeout 180m
--- PASS: TestAccECSCluster_disappears (24.32s)
--- PASS: TestAccECSCluster_basic (28.39s)
--- PASS: TestAccECSCluster_capacityProviders (37.61s)
--- PASS: TestAccECSCluster_tags (48.72s)
--- PASS: TestAccECSCluster_configuration (50.45s)
--- PASS: TestAccECSCluster_capacityProvidersNoStrategy (51.77s)
--- PASS: TestAccECSCluster_singleCapacityProvider (65.77s)
--- PASS: TestAccECSCluster_containerInsights (66.75s)
--- PASS: TestAccECSCluster_capacityProvidersUpdate (71.79s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecs	73.020s

[github-actions]

This functionality has been released in v4.3.0 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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