Handle ObjectNotFoundException gracefully when deleting app autoscaling target

[sworisbreathing]

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Closes #18114

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

N/A. The existing test cases don't cover such a scenario and I'm not sure how to set the test up myself. I copied the fix for aws_appautoscaling_policy which itself doesn't appear to cover this scenario.

[anGie44]

Looks great @sworisbreathing 🚀

Output of acceptance tests (commercial):

--- PASS: TestAccAWSAppautoScalingTarget_multipleTargets (25.54s)
--- PASS: TestAccAWSAppautoScalingTarget_optionalRoleArn (26.08s)
--- PASS: TestAccAWSAppautoScalingTarget_spotFleetRequest (76.77s)
--- PASS: TestAccAWSAppautoScalingTarget_disappears (86.35s)
--- PASS: TestAccAWSAppautoScalingTarget_basic (100.04s)
--- PASS: TestAccAWSAppautoScalingTarget_emrCluster (843.12s)

[ghost]

This has been released in version 3.39.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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