r/ecs _cluster - add configuration block + refactor to user finder and waiters package

[DrFaust92]

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Closes #18334.

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSEcsCluster_'
--- PASS: TestAccAWSEcsCluster_disappears (40.63s)
--- PASS: TestAccAWSEcsCluster_basic (50.59s)
--- PASS: TestAccAWSEcsCluster_CapacityProviders (76.15s)
--- PASS: TestAccAWSEcsCluster_Tags (95.17s)
--- PASS: TestAccAWSEcsCluster_CapacityProvidersNoStrategy (95.57s)
--- PASS: TestAccAWSEcsCluster_configuration (103.91s)
--- PASS: TestAccAWSEcsCluster_containerInsights (112.43s)
--- PASS: TestAccAWSEcsCluster_CapacityProvidersUpdate (129.26s)
--- PASS: TestAccAWSEcsCluster_SingleCapacityProvider (143.15s)

[ewbankkit]

LGTM 🚀.

Commercial

% make testacc TEST=./aws TESTARGS='-run=TestAccAWSEcsCluster_'           
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSEcsCluster_ -timeout 180m
=== RUN   TestAccAWSEcsCluster_basic
=== PAUSE TestAccAWSEcsCluster_basic
=== RUN   TestAccAWSEcsCluster_disappears
=== PAUSE TestAccAWSEcsCluster_disappears
=== RUN   TestAccAWSEcsCluster_Tags
=== PAUSE TestAccAWSEcsCluster_Tags
=== RUN   TestAccAWSEcsCluster_SingleCapacityProvider
=== PAUSE TestAccAWSEcsCluster_SingleCapacityProvider
=== RUN   TestAccAWSEcsCluster_CapacityProviders
=== PAUSE TestAccAWSEcsCluster_CapacityProviders
=== RUN   TestAccAWSEcsCluster_CapacityProvidersUpdate
=== PAUSE TestAccAWSEcsCluster_CapacityProvidersUpdate
=== RUN   TestAccAWSEcsCluster_CapacityProvidersNoStrategy
=== PAUSE TestAccAWSEcsCluster_CapacityProvidersNoStrategy
=== RUN   TestAccAWSEcsCluster_containerInsights
=== PAUSE TestAccAWSEcsCluster_containerInsights
=== RUN   TestAccAWSEcsCluster_configuration
=== PAUSE TestAccAWSEcsCluster_configuration
=== CONT  TestAccAWSEcsCluster_basic
=== CONT  TestAccAWSEcsCluster_CapacityProvidersUpdate
=== CONT  TestAccAWSEcsCluster_SingleCapacityProvider
=== CONT  TestAccAWSEcsCluster_CapacityProviders
=== CONT  TestAccAWSEcsCluster_configuration
=== CONT  TestAccAWSEcsCluster_containerInsights
=== CONT  TestAccAWSEcsCluster_CapacityProvidersNoStrategy
=== CONT  TestAccAWSEcsCluster_disappears
=== CONT  TestAccAWSEcsCluster_Tags
--- PASS: TestAccAWSEcsCluster_disappears (24.45s)
--- PASS: TestAccAWSEcsCluster_basic (27.26s)
--- PASS: TestAccAWSEcsCluster_Tags (46.39s)
--- PASS: TestAccAWSEcsCluster_CapacityProviders (49.02s)
--- PASS: TestAccAWSEcsCluster_CapacityProvidersNoStrategy (53.20s)
--- PASS: TestAccAWSEcsCluster_configuration (53.92s)
--- PASS: TestAccAWSEcsCluster_containerInsights (63.10s)
--- PASS: TestAccAWSEcsCluster_CapacityProvidersUpdate (81.81s)
--- PASS: TestAccAWSEcsCluster_SingleCapacityProvider (97.50s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	100.935s

GovCloud

% make testacc TEST=./aws TESTARGS='-run=TestAccAWSEcsCluster_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSEcsCluster_ -timeout 180m
=== RUN   TestAccAWSEcsCluster_basic
=== PAUSE TestAccAWSEcsCluster_basic
=== RUN   TestAccAWSEcsCluster_disappears
=== PAUSE TestAccAWSEcsCluster_disappears
=== RUN   TestAccAWSEcsCluster_Tags
=== PAUSE TestAccAWSEcsCluster_Tags
=== RUN   TestAccAWSEcsCluster_SingleCapacityProvider
=== PAUSE TestAccAWSEcsCluster_SingleCapacityProvider
=== RUN   TestAccAWSEcsCluster_CapacityProviders
=== PAUSE TestAccAWSEcsCluster_CapacityProviders
=== RUN   TestAccAWSEcsCluster_CapacityProvidersUpdate
=== PAUSE TestAccAWSEcsCluster_CapacityProvidersUpdate
=== RUN   TestAccAWSEcsCluster_CapacityProvidersNoStrategy
=== PAUSE TestAccAWSEcsCluster_CapacityProvidersNoStrategy
=== RUN   TestAccAWSEcsCluster_containerInsights
=== PAUSE TestAccAWSEcsCluster_containerInsights
=== RUN   TestAccAWSEcsCluster_configuration
=== PAUSE TestAccAWSEcsCluster_configuration
=== CONT  TestAccAWSEcsCluster_basic
=== CONT  TestAccAWSEcsCluster_CapacityProvidersUpdate
=== CONT  TestAccAWSEcsCluster_Tags
=== CONT  TestAccAWSEcsCluster_disappears
=== CONT  TestAccAWSEcsCluster_containerInsights
=== CONT  TestAccAWSEcsCluster_CapacityProvidersNoStrategy
=== CONT  TestAccAWSEcsCluster_configuration
=== CONT  TestAccAWSEcsCluster_CapacityProviders
=== CONT  TestAccAWSEcsCluster_SingleCapacityProvider
--- PASS: TestAccAWSEcsCluster_disappears (28.08s)
--- PASS: TestAccAWSEcsCluster_basic (34.10s)
--- PASS: TestAccAWSEcsCluster_CapacityProviders (57.16s)
--- PASS: TestAccAWSEcsCluster_Tags (58.03s)
--- PASS: TestAccAWSEcsCluster_CapacityProvidersNoStrategy (59.41s)
--- PASS: TestAccAWSEcsCluster_configuration (61.74s)
--- PASS: TestAccAWSEcsCluster_containerInsights (76.23s)
--- PASS: TestAccAWSEcsCluster_CapacityProvidersUpdate (83.11s)
--- PASS: TestAccAWSEcsCluster_SingleCapacityProvider (101.99s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	105.047s

[github-actions]

This functionality has been released in v3.46.0 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]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.