events/bus_policy: Fix diffs with policy

[YakDriver]

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Relates #21968

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

% make testacc TESTS=TestAccEventsBusPolicy_ PKG=events 
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/events/... -v -count 1 -parallel 20 -run='TestAccEventsBusPolicy_' -timeout 180m
--- PASS: TestAccEventsBusPolicy_ignoreEquivalent (22.35s)
--- PASS: TestAccEventsBusPolicy_basic (27.73s)
--- PASS: TestAccEventsBusPolicy_disappears (133.91s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/events	135.115s

Output from acceptance testing (GovCloud):

% make testacc TESTS=TestAccEventsBusPolicy_ PKG=events 
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/events/... -v -count 1 -parallel 20 -run='TestAccEventsBusPolicy_' -timeout 180m
--- PASS: TestAccEventsBusPolicy_ignoreEquivalent (27.80s)
--- PASS: TestAccEventsBusPolicy_basic (34.88s)
--- PASS: TestAccEventsBusPolicy_disappears (138.09s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/events	139.324s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccEventsBusPolicy_ PKG=events
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/events/... -v -count 1 -parallel 20 -run='TestAccEventsBusPolicy_' -timeout 180m
=== RUN   TestAccEventsBusPolicy_basic
=== PAUSE TestAccEventsBusPolicy_basic
=== RUN   TestAccEventsBusPolicy_ignoreEquivalent
=== PAUSE TestAccEventsBusPolicy_ignoreEquivalent
=== RUN   TestAccEventsBusPolicy_disappears
=== PAUSE TestAccEventsBusPolicy_disappears
=== CONT  TestAccEventsBusPolicy_basic
=== CONT  TestAccEventsBusPolicy_disappears
=== CONT  TestAccEventsBusPolicy_ignoreEquivalent
--- PASS: TestAccEventsBusPolicy_ignoreEquivalent (24.56s)
--- PASS: TestAccEventsBusPolicy_basic (29.90s)
--- PASS: TestAccEventsBusPolicy_disappears (135.34s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/events	140.823s

[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]

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