r/aws_route: Remove extraneous Exists function

[ewbankkit]

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Relates #9953.

Includes testAccCheckResourceDisappears() from #12864.

Release note for CHANGELOG:

NONE

Output from acceptance testing:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSRoute_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 1 -run=TestAccAWSRoute_ -timeout 120m
=== RUN   TestAccAWSRoute_basic
=== PAUSE TestAccAWSRoute_basic
=== RUN   TestAccAWSRoute_disappears
=== PAUSE TestAccAWSRoute_disappears
=== RUN   TestAccAWSRoute_ipv6Support
=== PAUSE TestAccAWSRoute_ipv6Support
=== RUN   TestAccAWSRoute_ipv6ToInternetGateway
=== PAUSE TestAccAWSRoute_ipv6ToInternetGateway
=== RUN   TestAccAWSRoute_ipv6ToInstance
=== PAUSE TestAccAWSRoute_ipv6ToInstance
=== RUN   TestAccAWSRoute_ipv6ToNetworkInterface
=== PAUSE TestAccAWSRoute_ipv6ToNetworkInterface
=== RUN   TestAccAWSRoute_ipv6ToPeeringConnection
=== PAUSE TestAccAWSRoute_ipv6ToPeeringConnection
=== RUN   TestAccAWSRoute_changeRouteTable
=== PAUSE TestAccAWSRoute_changeRouteTable
=== RUN   TestAccAWSRoute_changeCidr
=== PAUSE TestAccAWSRoute_changeCidr
=== RUN   TestAccAWSRoute_noopdiff
=== PAUSE TestAccAWSRoute_noopdiff
=== RUN   TestAccAWSRoute_doesNotCrashWithVPCEndpoint
=== PAUSE TestAccAWSRoute_doesNotCrashWithVPCEndpoint
=== RUN   TestAccAWSRoute_TransitGatewayID_DestinationCidrBlock
=== PAUSE TestAccAWSRoute_TransitGatewayID_DestinationCidrBlock
=== CONT  TestAccAWSRoute_basic
--- PASS: TestAccAWSRoute_basic (50.67s)
=== CONT  TestAccAWSRoute_changeRouteTable
--- PASS: TestAccAWSRoute_changeRouteTable (80.50s)
=== CONT  TestAccAWSRoute_TransitGatewayID_DestinationCidrBlock
--- PASS: TestAccAWSRoute_TransitGatewayID_DestinationCidrBlock (366.53s)
=== CONT  TestAccAWSRoute_doesNotCrashWithVPCEndpoint
--- PASS: TestAccAWSRoute_doesNotCrashWithVPCEndpoint (57.73s)
=== CONT  TestAccAWSRoute_noopdiff
--- PASS: TestAccAWSRoute_noopdiff (140.10s)
=== CONT  TestAccAWSRoute_changeCidr
--- PASS: TestAccAWSRoute_changeCidr (79.23s)
=== CONT  TestAccAWSRoute_ipv6ToInstance
--- PASS: TestAccAWSRoute_ipv6ToInstance (146.16s)
=== CONT  TestAccAWSRoute_ipv6ToPeeringConnection
--- PASS: TestAccAWSRoute_ipv6ToPeeringConnection (41.41s)
=== CONT  TestAccAWSRoute_ipv6ToNetworkInterface
--- PASS: TestAccAWSRoute_ipv6ToNetworkInterface (159.35s)
=== CONT  TestAccAWSRoute_ipv6Support
--- PASS: TestAccAWSRoute_ipv6Support (56.86s)
=== CONT  TestAccAWSRoute_ipv6ToInternetGateway
--- PASS: TestAccAWSRoute_ipv6ToInternetGateway (50.73s)
=== CONT  TestAccAWSRoute_disappears
--- PASS: TestAccAWSRoute_disappears (46.83s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	1276.139s

[bflad]

#12864 has been merged so that functionality does not need to be reviewed again. 👍

[ghost]

This has been released in version 2.60.0 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 for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!