sns: Improve policy diffs

[YakDriver]

Description

Relations

Relates #23288

References

Output from Acceptance Testing

% make testacc TESTS="TestAccSNSTopicPolicy_|TestAccSNSTopic_" PKG=sns  
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/sns/... -v -count 1 -parallel 20 -run='TestAccSNSTopicPolicy_|TestAccSNSTopic_'  -timeout 180m
=== RUN   TestAccSNSTopicPolicy_basic
=== PAUSE TestAccSNSTopicPolicy_basic
=== RUN   TestAccSNSTopicPolicy_updated
=== PAUSE TestAccSNSTopicPolicy_updated
=== RUN   TestAccSNSTopicPolicy_Disappears_topic
=== PAUSE TestAccSNSTopicPolicy_Disappears_topic
=== RUN   TestAccSNSTopicPolicy_disappears
=== PAUSE TestAccSNSTopicPolicy_disappears
=== RUN   TestAccSNSTopicPolicy_ignoreEquivalent
=== PAUSE TestAccSNSTopicPolicy_ignoreEquivalent
=== RUN   TestAccSNSTopic_basic
=== PAUSE TestAccSNSTopic_basic
=== RUN   TestAccSNSTopic_disappears
=== PAUSE TestAccSNSTopic_disappears
=== RUN   TestAccSNSTopic_name
=== PAUSE TestAccSNSTopic_name
=== RUN   TestAccSNSTopic_namePrefix
=== PAUSE TestAccSNSTopic_namePrefix
=== RUN   TestAccSNSTopic_tags
=== PAUSE TestAccSNSTopic_tags
=== RUN   TestAccSNSTopic_policy
=== PAUSE TestAccSNSTopic_policy
=== RUN   TestAccSNSTopic_withIAMRole
=== PAUSE TestAccSNSTopic_withIAMRole
=== RUN   TestAccSNSTopic_withFakeIAMRole
=== PAUSE TestAccSNSTopic_withFakeIAMRole
=== RUN   TestAccSNSTopic_withDeliveryPolicy
=== PAUSE TestAccSNSTopic_withDeliveryPolicy
=== RUN   TestAccSNSTopic_deliveryStatus
=== PAUSE TestAccSNSTopic_deliveryStatus
=== RUN   TestAccSNSTopic_NameGenerated_fifoTopic
=== PAUSE TestAccSNSTopic_NameGenerated_fifoTopic
=== RUN   TestAccSNSTopic_Name_fifoTopic
=== PAUSE TestAccSNSTopic_Name_fifoTopic
=== RUN   TestAccSNSTopic_NamePrefix_fifoTopic
=== PAUSE TestAccSNSTopic_NamePrefix_fifoTopic
=== RUN   TestAccSNSTopic_fifoWithContentBasedDeduplication
=== PAUSE TestAccSNSTopic_fifoWithContentBasedDeduplication
=== RUN   TestAccSNSTopic_fifoExpectContentBasedDeduplicationError
=== PAUSE TestAccSNSTopic_fifoExpectContentBasedDeduplicationError
=== RUN   TestAccSNSTopic_encryption
=== PAUSE TestAccSNSTopic_encryption
=== CONT  TestAccSNSTopicPolicy_basic
=== CONT  TestAccSNSTopic_withIAMRole
=== CONT  TestAccSNSTopic_encryption
=== CONT  TestAccSNSTopic_disappears
=== CONT  TestAccSNSTopic_deliveryStatus
=== CONT  TestAccSNSTopic_fifoWithContentBasedDeduplication
=== CONT  TestAccSNSTopic_NamePrefix_fifoTopic
=== CONT  TestAccSNSTopic_name
=== CONT  TestAccSNSTopic_namePrefix
=== CONT  TestAccSNSTopic_NameGenerated_fifoTopic
=== CONT  TestAccSNSTopicPolicy_disappears
=== CONT  TestAccSNSTopicPolicy_Disappears_topic
=== CONT  TestAccSNSTopic_tags
=== CONT  TestAccSNSTopic_basic
=== CONT  TestAccSNSTopic_Name_fifoTopic
=== CONT  TestAccSNSTopic_withDeliveryPolicy
=== CONT  TestAccSNSTopic_withFakeIAMRole
=== CONT  TestAccSNSTopic_fifoExpectContentBasedDeduplicationError
=== CONT  TestAccSNSTopic_policy
=== CONT  TestAccSNSTopicPolicy_ignoreEquivalent
--- PASS: TestAccSNSTopic_fifoExpectContentBasedDeduplicationError (6.30s)
=== CONT  TestAccSNSTopicPolicy_updated
--- PASS: TestAccSNSTopic_disappears (43.14s)
--- PASS: TestAccSNSTopicPolicy_Disappears_topic (48.64s)
--- PASS: TestAccSNSTopicPolicy_disappears (55.62s)
--- PASS: TestAccSNSTopic_NameGenerated_fifoTopic (61.11s)
--- PASS: TestAccSNSTopic_basic (62.00s)
--- PASS: TestAccSNSTopic_namePrefix (62.47s)
--- PASS: TestAccSNSTopic_NamePrefix_fifoTopic (62.85s)
--- PASS: TestAccSNSTopic_Name_fifoTopic (63.59s)
--- PASS: TestAccSNSTopic_withDeliveryPolicy (63.91s)
--- PASS: TestAccSNSTopic_policy (64.01s)
--- PASS: TestAccSNSTopic_name (64.15s)
--- PASS: TestAccSNSTopicPolicy_basic (64.25s)
--- PASS: TestAccSNSTopic_withIAMRole (67.48s)
--- PASS: TestAccSNSTopicPolicy_ignoreEquivalent (69.46s)
--- PASS: TestAccSNSTopic_deliveryStatus (72.27s)
--- PASS: TestAccSNSTopic_encryption (75.26s)
--- PASS: TestAccSNSTopic_fifoWithContentBasedDeduplication (78.70s)
--- PASS: TestAccSNSTopicPolicy_updated (72.49s)
--- PASS: TestAccSNSTopic_tags (91.19s)
--- PASS: TestAccSNSTopic_withFakeIAMRole (144.95s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/sns	146.830s

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