resource/aws_ecs_task_definition: Prevents failures when target was deleted outside of Terraform

[gdavison]

Description

If an aws_ecs_task_definition is deleted outside of Terraform, it would cause an error

Closes #29749.

Output from Acceptance Testing

% make testacc PKG=ecs TESTS=TestAccECSTaskDefinition_

--- PASS: TestAccECSTaskDefinition_invalidContainerDefinition (5.57s)
--- PASS: TestAccECSTaskDefinition_containerDefinitionDockerLabels (61.26s)
--- PASS: TestAccECSTaskDefinition_containerDefinitionNullPortMapping (65.35s)
--- PASS: TestAccECSTaskDefinition_unknownContainerDefinitions (65.69s)
--- PASS: TestAccECSTaskDefinition_pidMode (74.77s)
--- PASS: TestAccECSTaskDefinition_inferenceAccelerator (79.75s)
--- PASS: TestAccECSTaskDefinition_arrays (80.21s)
--- PASS: TestAccECSTaskDefinition_constraint (87.62s)
--- PASS: TestAccECSTaskDefinition_Fargate_ephemeralStorage (88.30s)
--- PASS: TestAccECSTaskDefinition_trackLatest (88.44s)
--- PASS: TestAccECSTaskDefinition_networkMode (88.54s)
--- PASS: TestAccECSTaskDefinition_proxy (88.64s)
--- PASS: TestAccECSTaskDefinition_EFSVolume_basic (90.32s)
--- PASS: TestAccECSTaskDefinition_executionRole (90.41s)
--- PASS: TestAccECSTaskDefinition_ipcMode (90.47s)
--- PASS: TestAccECSTaskDefinition_DockerVolume_minimal (90.34s)
--- PASS: TestAccECSTaskDefinition_basic (137.98s)
--- PASS: TestAccECSTaskDefinition_changeVolumesForcesNewResource (138.61s)
--- PASS: TestAccECSTaskDefinition_taskRoleARN (85.92s)
--- PASS: TestAccECSTaskDefinition_Fargate_runtimePlatformWithoutArch (84.04s)
--- PASS: TestAccECSTaskDefinition_EFSVolume_minimal (86.80s)
--- PASS: TestAccECSTaskDefinition_DockerVolume_taskScoped (64.58s)
--- PASS: TestAccECSTaskDefinition_Fargate_runtimePlatform (76.85s)
--- PASS: TestAccECSTaskDefinition_configuredAtLaunch (71.43s)
--- PASS: TestAccECSTaskDefinition_runtimePlatform (82.01s)
--- PASS: TestAccECSTaskDefinition_v5590ContainerDefinitionsRegression (162.35s)
--- PASS: TestAccECSTaskDefinition_scratchVolume (72.79s)
--- PASS: TestAccECSTaskDefinition_tags (169.33s)
--- PASS: TestAccECSTaskDefinition_EFSVolume_transitEncryption (82.60s)
--- PASS: TestAccECSTaskDefinition_EFSVolume_transitEncryptionMinimal (80.98s)
--- PASS: TestAccECSTaskDefinition_Fargate_basic (83.86s)
--- PASS: TestAccECSTaskDefinition_EFSVolume_transitEncryptionDisabled (83.35s)
--- PASS: TestAccECSTaskDefinition_EFSVolume_accessPoint (82.59s)
--- PASS: TestAccECSTaskDefinition_DockerVolume_basic (36.29s)
--- PASS: TestAccECSTaskDefinition_disappears (42.25s)
--- PASS: TestAccECSTaskDefinition_containerDefinitionEmptyPortMappings (183.14s)
--- PASS: TestAccECSTaskDefinition_service (177.51s)
--- PASS: TestAccECSTaskDefinition_fsxWinFileSystem (3285.52s)

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccECSTaskDefinition_basic\|TestAccECSTaskDefinition_disappears' PKG=ecs
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.1 test ./internal/service/ecs/... -v -count 1 -parallel 20  -run=TestAccECSTaskDefinition_basic\|TestAccECSTaskDefinition_disappears -timeout 360m
=== RUN   TestAccECSTaskDefinition_basic
=== PAUSE TestAccECSTaskDefinition_basic
=== RUN   TestAccECSTaskDefinition_disappears
=== PAUSE TestAccECSTaskDefinition_disappears
=== CONT  TestAccECSTaskDefinition_basic
=== CONT  TestAccECSTaskDefinition_disappears
--- PASS: TestAccECSTaskDefinition_disappears (19.45s)
--- PASS: TestAccECSTaskDefinition_basic (22.08s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecs	27.492s

[github-actions]

This functionality has been released in v5.72.0 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!