ec2/vpc_endpoint: Fix erroneous diffs with equivalent policies

[YakDriver]

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Relates #21968

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

% make testacc TESTS=TestAccEC2VPCEndpoint_ PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccEC2VPCEndpoint_' -timeout 180m
--- PASS: TestAccEC2VPCEndpoint_disappears (36.26s)
--- PASS: TestAccEC2VPCEndpoint_gatewayBasic (40.61s)
--- PASS: TestAccEC2VPCEndpoint_ignoreEquivalent (54.81s)
--- PASS: TestAccEC2VPCEndpoint_gatewayPolicy (68.12s)
--- PASS: TestAccEC2VPCEndpoint_tags (80.34s)
--- PASS: TestAccEC2VPCEndpoint_gatewayWithRouteTableAndPolicy (80.82s)
--- PASS: TestAccEC2VPCEndpoint_interfaceBasic (88.38s)
--- PASS: TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnCreate (277.97s)
--- PASS: TestAccEC2VPCEndpoint_VPCEndpointType_gatewayLoadBalancer (306.22s)
--- PASS: TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnUpdate (313.55s)
--- PASS: TestAccEC2VPCEndpoint_interfaceWithSubnetAndSecurityGroup (413.56s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	415.290s

Output from acceptance testing (GovCloud):

% make testacc TESTS=TestAccEC2VPCEndpoint_ PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccEC2VPCEndpoint_' -timeout 180m
--- PASS: TestAccEC2VPCEndpoint_disappears (36.49s)
--- PASS: TestAccEC2VPCEndpoint_gatewayBasic (40.11s)
--- PASS: TestAccEC2VPCEndpoint_ignoreEquivalent (57.82s)
--- PASS: TestAccEC2VPCEndpoint_gatewayPolicy (70.88s)
--- PASS: TestAccEC2VPCEndpoint_interfaceBasic (73.45s)
--- PASS: TestAccEC2VPCEndpoint_gatewayWithRouteTableAndPolicy (78.59s)
--- PASS: TestAccEC2VPCEndpoint_tags (79.94s)
--- PASS: TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnUpdate (292.86s)
--- PASS: TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnCreate (297.68s)
--- PASS: TestAccEC2VPCEndpoint_VPCEndpointType_gatewayLoadBalancer (320.04s)
--- PASS: TestAccEC2VPCEndpoint_interfaceWithSubnetAndSecurityGroup (349.87s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	351.217s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccEC2VPCEndpoint_ PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccEC2VPCEndpoint_' -timeout 180m
=== RUN   TestAccEC2VPCEndpoint_gatewayBasic
=== PAUSE TestAccEC2VPCEndpoint_gatewayBasic
=== RUN   TestAccEC2VPCEndpoint_gatewayWithRouteTableAndPolicy
=== PAUSE TestAccEC2VPCEndpoint_gatewayWithRouteTableAndPolicy
=== RUN   TestAccEC2VPCEndpoint_gatewayPolicy
=== PAUSE TestAccEC2VPCEndpoint_gatewayPolicy
=== RUN   TestAccEC2VPCEndpoint_ignoreEquivalent
=== PAUSE TestAccEC2VPCEndpoint_ignoreEquivalent
=== RUN   TestAccEC2VPCEndpoint_interfaceBasic
=== PAUSE TestAccEC2VPCEndpoint_interfaceBasic
=== RUN   TestAccEC2VPCEndpoint_interfaceWithSubnetAndSecurityGroup
=== PAUSE TestAccEC2VPCEndpoint_interfaceWithSubnetAndSecurityGroup
=== RUN   TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnCreate
=== PAUSE TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnCreate
=== RUN   TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnUpdate
=== PAUSE TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnUpdate
=== RUN   TestAccEC2VPCEndpoint_disappears
=== PAUSE TestAccEC2VPCEndpoint_disappears
=== RUN   TestAccEC2VPCEndpoint_tags
=== PAUSE TestAccEC2VPCEndpoint_tags
=== CONT  TestAccEC2VPCEndpoint_gatewayBasic
=== CONT  TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnCreate
=== CONT  TestAccEC2VPCEndpoint_tags
=== CONT  TestAccEC2VPCEndpoint_gatewayPolicy
=== CONT  TestAccEC2VPCEndpoint_ignoreEquivalent
=== CONT  TestAccEC2VPCEndpoint_interfaceWithSubnetAndSecurityGroup
=== CONT  TestAccEC2VPCEndpoint_interfaceBasic
=== CONT  TestAccEC2VPCEndpoint_disappears
=== CONT  TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnUpdate
=== CONT  TestAccEC2VPCEndpoint_gatewayWithRouteTableAndPolicy
--- PASS: TestAccEC2VPCEndpoint_disappears (36.13s)
--- PASS: TestAccEC2VPCEndpoint_gatewayBasic (41.14s)
--- PASS: TestAccEC2VPCEndpoint_ignoreEquivalent (56.71s)
--- PASS: TestAccEC2VPCEndpoint_gatewayPolicy (69.41s)
--- PASS: TestAccEC2VPCEndpoint_tags (80.04s)
--- PASS: TestAccEC2VPCEndpoint_gatewayWithRouteTableAndPolicy (82.31s)
--- PASS: TestAccEC2VPCEndpoint_interfaceBasic (116.77s)
--- PASS: TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnCreate (302.96s)
--- PASS: TestAccEC2VPCEndpoint_interfaceNonAWSServiceAcceptOnUpdate (316.71s)
--- PASS: TestAccEC2VPCEndpoint_interfaceWithSubnetAndSecurityGroup (560.84s)

[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]

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.