glue/resource_policy: Fix diffs with equivalent policies

[YakDriver]

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Relates #21968

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

% make testacc TESTS="TestAccGlue_serial/ResourcePolicy" PKG=glue 
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/glue/... -v -count 1 -parallel 20 -run='TestAccGlue_serial/ResourcePolicy' -timeout 180m
--- PASS: TestAccGlue_serial (97.65s)
    --- PASS: TestAccGlue_serial/ResourcePolicy (97.65s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/basic (13.96s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/update (23.26s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/hybrid (32.21s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/disappears (11.05s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/equivalent (17.17s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/glue	99.044s

Output from acceptance testing (GovCloud):

% make testacc TESTS="TestAccGlue_serial/ResourcePolicy" PKG=glue 
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/glue/... -v -count 1 -parallel 20 -run='TestAccGlue_serial/ResourcePolicy' -timeout 180m
--- PASS: TestAccGlue_serial (134.71s)
    --- PASS: TestAccGlue_serial/ResourcePolicy (134.71s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/hybrid (45.39s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/disappears (14.98s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/equivalent (24.79s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/basic (18.09s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/update (31.46s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/glue	135.951s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS="TestAccGlue_serial/ResourcePolicy" PKG=glue 
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/glue/... -v -count 1 -parallel 20 -run='TestAccGlue_serial/ResourcePolicy' -timeout 180m
=== RUN   TestAccGlue_serial
=== RUN   TestAccGlue_serial/ResourcePolicy
=== RUN   TestAccGlue_serial/ResourcePolicy/update
=== RUN   TestAccGlue_serial/ResourcePolicy/hybrid
=== RUN   TestAccGlue_serial/ResourcePolicy/disappears
=== RUN   TestAccGlue_serial/ResourcePolicy/equivalent
=== RUN   TestAccGlue_serial/ResourcePolicy/basic
--- PASS: TestAccGlue_serial (104.58s)
    --- PASS: TestAccGlue_serial/ResourcePolicy (104.58s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/update (26.88s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/hybrid (33.30s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/disappears (11.14s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/equivalent (17.58s)
        --- PASS: TestAccGlue_serial/ResourcePolicy/basic (15.68s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/glue	108.441s

[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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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.