ecr/lifecycle_policy: Fix diffs when policy equivalent

[YakDriver]

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Relates #21968
Relates #22004

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

% make testacc TESTS=TestAccECRLifecyclePolicy_ PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRLifecyclePolicy_' -timeout 180m
--- PASS: TestAccECRLifecyclePolicy_basic (16.38s)
--- PASS: TestAccECRLifecyclePolicy_ignoreEquivalent (21.47s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	22.770s

Output from acceptance testing (GovCloud):

% make testacc TESTS=TestAccECRLifecyclePolicy_ PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRLifecyclePolicy_' -timeout 180m
--- PASS: TestAccECRLifecyclePolicy_basic (21.90s)
--- PASS: TestAccECRLifecyclePolicy_ignoreEquivalent (28.49s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	30.143s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccECRLifecyclePolicy_ PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRLifecyclePolicy_' -timeout 180m
=== RUN   TestAccECRLifecyclePolicy_basic
=== PAUSE TestAccECRLifecyclePolicy_basic
=== RUN   TestAccECRLifecyclePolicy_ignoreEquivalent
=== PAUSE TestAccECRLifecyclePolicy_ignoreEquivalent
=== CONT  TestAccECRLifecyclePolicy_basic
=== CONT  TestAccECRLifecyclePolicy_ignoreEquivalent
--- PASS: TestAccECRLifecyclePolicy_basic (21.76s)
--- PASS: TestAccECRLifecyclePolicy_ignoreEquivalent (27.65s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	33.620s

[github-actions]

This functionality has been released in v3.70.0 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.