resource/apprunner_service: fix resource creation with instance role and instance_configuration

[anGie44]

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Closes #19484

Notes:

• AccTest TestAccAwsAppRunnerService_ImageRepository_InstanceConfiguration was previously failing due to failure to assume role (iam eventual consistency 🤦‍♀️), so retry handling has been added.
• While fixing the mentioned test, it became apparent that the instance_configuration cpu and memory values returned from API and set in state did not match original values if configured in vCPU or GB, respectively. Thus DiffSuppressFuncs have been added to address these.

Output from acceptance testing:

--- PASS: TestAccAwsAppRunnerService_ImageRepository_basic (241.08s)
--- PASS: TestAccAwsAppRunnerService_disappears (246.84s)
--- PASS: TestAccAwsAppRunnerService_tags (278.58s)
--- PASS: TestAccAwsAppRunnerService_ImageRepository_AutoScalingConfiguration (315.06s)
--- PASS: TestAccAwsAppRunnerService_ImageRepository_InstanceConfiguration (361.75s)
--- PASS: TestAccAwsAppRunnerService_ImageRepository_HealthCheckConfiguration (484.59s)
--- PASS: TestAccAwsAppRunnerService_ImageRepository_EncryptionConfiguration (533.10s)

[ewbankkit]

LGTM 🚀.

Commercial

% make testacc TEST=./aws TESTARGS='-run=TestAccAwsAppRunnerService_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAwsAppRunnerService_ -timeout 180m
=== RUN   TestAccAwsAppRunnerService_ImageRepository_basic
=== PAUSE TestAccAwsAppRunnerService_ImageRepository_basic
=== RUN   TestAccAwsAppRunnerService_ImageRepository_AutoScalingConfiguration
=== PAUSE TestAccAwsAppRunnerService_ImageRepository_AutoScalingConfiguration
=== RUN   TestAccAwsAppRunnerService_ImageRepository_EncryptionConfiguration
=== PAUSE TestAccAwsAppRunnerService_ImageRepository_EncryptionConfiguration
=== RUN   TestAccAwsAppRunnerService_ImageRepository_HealthCheckConfiguration
=== PAUSE TestAccAwsAppRunnerService_ImageRepository_HealthCheckConfiguration
=== RUN   TestAccAwsAppRunnerService_ImageRepository_InstanceConfiguration
=== PAUSE TestAccAwsAppRunnerService_ImageRepository_InstanceConfiguration
=== RUN   TestAccAwsAppRunnerService_disappears
=== PAUSE TestAccAwsAppRunnerService_disappears
=== RUN   TestAccAwsAppRunnerService_tags
=== PAUSE TestAccAwsAppRunnerService_tags
=== CONT  TestAccAwsAppRunnerService_ImageRepository_basic
=== CONT  TestAccAwsAppRunnerService_ImageRepository_InstanceConfiguration
=== CONT  TestAccAwsAppRunnerService_tags
=== CONT  TestAccAwsAppRunnerService_ImageRepository_EncryptionConfiguration
=== CONT  TestAccAwsAppRunnerService_ImageRepository_AutoScalingConfiguration
=== CONT  TestAccAwsAppRunnerService_disappears
=== CONT  TestAccAwsAppRunnerService_ImageRepository_HealthCheckConfiguration
--- PASS: TestAccAwsAppRunnerService_ImageRepository_basic (229.38s)
--- PASS: TestAccAwsAppRunnerService_tags (248.20s)
--- PASS: TestAccAwsAppRunnerService_disappears (257.13s)
--- PASS: TestAccAwsAppRunnerService_ImageRepository_InstanceConfiguration (375.09s)
--- PASS: TestAccAwsAppRunnerService_ImageRepository_AutoScalingConfiguration (382.60s)
--- PASS: TestAccAwsAppRunnerService_ImageRepository_EncryptionConfiguration (449.17s)
--- PASS: TestAccAwsAppRunnerService_ImageRepository_HealthCheckConfiguration (507.23s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	510.794s

[ghost]

This has been released in version 3.43.0 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!

[github-actions]

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