bump default timeout for Transit Gateway Route Table Association to 15m

[albus-droid]

Description

This increases create wait timeouts for aws_ec2_transit_gateway_route_table_association from 5 minutes to 15 minutes to accommodate longer association times without failures.

Relations

Closes #42705

Output from Acceptance Testing

make testacc TESTS=TestAccTransitGateway_serial/RouteTableAssociation_basic PKG=ec2

make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.9 test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccTransitGateway_serial/RouteTableAssociation_basic'  -timeout 360m -vet=off
2025/05/23 20:30:44 Initializing Terraform AWS Provider...
=== RUN   TestAccTransitGateway_serial
=== PAUSE TestAccTransitGateway_serial
=== CONT  TestAccTransitGateway_serial
=== RUN   TestAccTransitGateway_serial/RouteTableAssociation_basic
=== PAUSE TestAccTransitGateway_serial/RouteTableAssociation_basic
=== RUN   TestAccTransitGateway_serial/DefaultRouteTableAssociation_basic
=== PAUSE TestAccTransitGateway_serial/DefaultRouteTableAssociation_basic
=== CONT  TestAccTransitGateway_serial/RouteTableAssociation_basic
=== CONT  TestAccTransitGateway_serial/DefaultRouteTableAssociation_basic
--- PASS: TestAccTransitGateway_serial (0.00s)
    --- PASS: TestAccTransitGateway_serial/DefaultRouteTableAssociation_basic (194.28s)
    --- PASS: TestAccTransitGateway_serial/RouteTableAssociation_basic (442.19s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ec2        442.387s

[github-actions]

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[github-actions]

✅ Thank you for correcting the previously detected issues! The maintainers appreciate your efforts to make the review process as smooth as possible.

[justinretzolk]

Notes from triage: The linked issue requests to add configurable timeouts rather than extending the default timeout, so I'm not sure the PR in its current state would satisfy that request.

[albus-droid]

Notes from triage: The linked issue requests to add configurable timeouts rather than extending the default timeout, so I'm not sure the PR in its current state would satisfy that request.

Thank you for reviewing the PR. I had some doubts regarding the implementation and had shared a comment

I initially considered modifying both waitTransitGatewayRouteTableAssociationCreated and waitTransitGatewayRouteTableAssociationDeleted. However, I hit a roadblock since these functions are reused in different places — for example, waitTransitGatewayRouteTableAssociationDeleted is also used in transitgateway_policy_table_association.go.

That made me unsure whether this would be the most appropriate or stylistically consistent approach.

I’d really appreciate any feedback or suggestions on the best way to proceed.