logs/resource_policy: Fix equivalent policy diffs

[YakDriver]

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Relates #21968

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

% make testacc TESTS=TestAccCloudWatchLogsResourcePolicy_ PKG=cloudwatchlogs
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatchlogs/... -v -count 1 -parallel 20 -run='TestAccCloudWatchLogsResourcePolicy_' -timeout 180m
--- PASS: TestAccCloudWatchLogsResourcePolicy_ignoreEquivalent (22.26s)
--- PASS: TestAccCloudWatchLogsResourcePolicy_basic (25.69s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatchlogs	27.496s

Output from acceptance testing (GovCloud):

% make testacc TESTS=TestAccCloudWatchLogsResourcePolicy_ PKG=cloudwatchlogs
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatchlogs/... -v -count 1 -parallel 20 -run='TestAccCloudWatchLogsResourcePolicy_' -timeout 180m
--- PASS: TestAccCloudWatchLogsResourcePolicy_ignoreEquivalent (28.89s)
--- PASS: TestAccCloudWatchLogsResourcePolicy_basic (33.42s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatchlogs	35.107s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccCloudWatchLogsResourcePolicy_ PKG=cloudwatchlogs
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatchlogs/... -v -count 1 -parallel 20 -run='TestAccCloudWatchLogsResourcePolicy_' -timeout 180m
=== RUN   TestAccCloudWatchLogsResourcePolicy_basic
=== PAUSE TestAccCloudWatchLogsResourcePolicy_basic
=== RUN   TestAccCloudWatchLogsResourcePolicy_ignoreEquivalent
=== PAUSE TestAccCloudWatchLogsResourcePolicy_ignoreEquivalent
=== CONT  TestAccCloudWatchLogsResourcePolicy_basic
=== CONT  TestAccCloudWatchLogsResourcePolicy_ignoreEquivalent
--- PASS: TestAccCloudWatchLogsResourcePolicy_ignoreEquivalent (25.92s)
--- PASS: TestAccCloudWatchLogsResourcePolicy_basic (29.82s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatchlogs	35.486s

[github-actions]

This functionality has been released in v3.69.0 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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