tests/resource/aws_default_route_table: Refactor acceptance tests in …

…preparation for future fixes/enhancements (#14012)

* r/aws_default_route_table: Rework 'TestAccAWSDefaultRouteTable_basic' and 'TestAccAWSDefaultRouteTable_disappears_Vpc'.

Acceptance test output:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSDefaultRouteTable_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 20 -run=TestAccAWSDefaultRouteTable_basic -timeout 120m
=== RUN   TestAccAWSDefaultRouteTable_basic
=== PAUSE TestAccAWSDefaultRouteTable_basic
=== CONT  TestAccAWSDefaultRouteTable_basic
--- PASS: TestAccAWSDefaultRouteTable_basic (53.01s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	53.064s
$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSDefaultRouteTable_disappears_Vpc'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 20 -run=TestAccAWSDefaultRouteTable_disappears_Vpc -timeout 120m
=== RUN   TestAccAWSDefaultRouteTable_disappears_Vpc
=== PAUSE TestAccAWSDefaultRouteTable_disappears_Vpc
=== CONT  TestAccAWSDefaultRouteTable_disappears_Vpc
--- PASS: TestAccAWSDefaultRouteTable_disappears_Vpc (24.54s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	24.591s

* r/aws_default_route_table: Rename 'TestAccAWSDefaultRouteTable_Route' to 'TestAccAWSDefaultRouteTable_Route_ConfigMode' to match r/aws_route_table.

Acceptance test output:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSDefaultRouteTable_Route_ConfigMode'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 20 -run=TestAccAWSDefaultRouteTable_Route_ConfigMode -timeout 120m
=== RUN   TestAccAWSDefaultRouteTable_Route_ConfigMode
=== PAUSE TestAccAWSDefaultRouteTable_Route_ConfigMode
=== CONT  TestAccAWSDefaultRouteTable_Route_ConfigMode
--- PASS: TestAccAWSDefaultRouteTable_Route_ConfigMode (102.58s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	102.647s

* r/aws_default_route_table: Rework 'TestAccAWSDefaultRouteTable_swap'.

Acceptance test output:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSDefaultRouteTable_swap'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 20 -run=TestAccAWSDefaultRouteTable_swap -timeout 120m
=== RUN   TestAccAWSDefaultRouteTable_swap
=== PAUSE TestAccAWSDefaultRouteTable_swap
=== CONT  TestAccAWSDefaultRouteTable_swap
--- PASS: TestAccAWSDefaultRouteTable_swap (109.41s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	109.499s

* r/aws_default_route_table: 'TestAccAWSDefaultRouteTable_disappears_Vpc' -> 'TestAccAWSDefaultRouteTable_vpcDisappears'.

* r/aws_default_route_table: Rework 'TestAccAWSDefaultRouteTable_ConditionalCidrBlock'.

Acceptance test output:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSDefaultRouteTable_ConditionalCidrBlock'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 20 -run=TestAccAWSDefaultRouteTable_ConditionalCidrBlock -timeout 120m
=== RUN   TestAccAWSDefaultRouteTable_ConditionalCidrBlock
=== PAUSE TestAccAWSDefaultRouteTable_ConditionalCidrBlock
=== CONT  TestAccAWSDefaultRouteTable_ConditionalCidrBlock
--- PASS: TestAccAWSDefaultRouteTable_ConditionalCidrBlock (79.63s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	80.192s

* r/aws_default_route_table: Rename 'TestAccAWSDefaultRouteTable_vpc_endpoint' to 'TestAccAWSDefaultRouteTable_VpcEndpointAssociation'.

Acceptance test output:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSDefaultRouteTable_VpcEndpointAssociation'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 20 -run=TestAccAWSDefaultRouteTable_VpcEndpointAssociation -timeout 120m
=== RUN   TestAccAWSDefaultRouteTable_VpcEndpointAssociation
=== PAUSE TestAccAWSDefaultRouteTable_VpcEndpointAssociation
=== CONT  TestAccAWSDefaultRouteTable_VpcEndpointAssociation
--- PASS: TestAccAWSDefaultRouteTable_VpcEndpointAssociation (57.87s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	57.930s

* r/aws_default_route_table: Rename 'TestAccAWSDefaultRouteTable_Route_TransitGatewayID' to 'TestAccAWSDefaultRouteTable_IPv4_To_TransitGateway'.

Acceptance test output:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSDefaultRouteTable_IPv4_To_TransitGateway'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 20 -run=TestAccAWSDefaultRouteTable_IPv4_To_TransitGateway -timeout 120m
=== RUN   TestAccAWSDefaultRouteTable_IPv4_To_TransitGateway
=== PAUSE TestAccAWSDefaultRouteTable_IPv4_To_TransitGateway
=== CONT  TestAccAWSDefaultRouteTable_IPv4_To_TransitGateway
--- PASS: TestAccAWSDefaultRouteTable_IPv4_To_TransitGateway (317.38s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	317.429s

* r/aws_default_route_table: Add 'testAccCheckAWSDefaultRouteTableRoute'.

* r/aws_default_route_table: Use 'testAccAvailableAZsNoOptInExcludeConfig'.

* Use 'testAccAvailableAZsNoOptInDefaultExcludeConfig'.

* r/aws_default_route_table: Add acceptance tests from #16131.

* Rename 'TestAccAWSDefaultRouteTable_Route_VpcEndpointId' to 'TestAccAWSDefaultRouteTable_IPv4_To_VpcEndpoint'.

* r/aws_default_route_table: Missing commit from rebase.

* Update aws/resource_aws_default_route_table_test.go

Co-authored-by: Brian Flad <bflad417@gmail.com>

Co-authored-by: Brian Flad <bflad417@gmail.com>