r/aws_securitylake_data_lake: Fix panic on import

[ewbankkit]

Description

The underlying cause was the auto-flattening of a nil string pointer into the ARN custom type.
AutoFlEx was not correctly dealing with flattening nil pointers to any primitive type into a custom type -- it always assumed that the target was the "non-custom", base type.

I foresee problems with slices and maps of custom primitive types...

Relations

Closes #34802.

Output from Acceptance Testing

% make testacc TESTARGS='-run=TestAccSecurityLake_serial/DataLake' PKG=securitylake
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/securitylake/... -v -count 1 -parallel 20  -run=TestAccSecurityLake_serial/DataLake -timeout 360m
=== RUN   TestAccSecurityLake_serial
=== PAUSE TestAccSecurityLake_serial
=== CONT  TestAccSecurityLake_serial
=== RUN   TestAccSecurityLake_serial/DataLake
=== RUN   TestAccSecurityLake_serial/DataLake/lifecycle
=== RUN   TestAccSecurityLake_serial/DataLake/lifecycleUpdate
=== RUN   TestAccSecurityLake_serial/DataLake/replication
=== RUN   TestAccSecurityLake_serial/DataLake/basic
=== RUN   TestAccSecurityLake_serial/DataLake/disappears
=== RUN   TestAccSecurityLake_serial/DataLake/tags
--- PASS: TestAccSecurityLake_serial (414.81s)
    --- PASS: TestAccSecurityLake_serial/DataLake (414.81s)
        --- PASS: TestAccSecurityLake_serial/DataLake/lifecycle (61.88s)
        --- PASS: TestAccSecurityLake_serial/DataLake/lifecycleUpdate (81.90s)
        --- PASS: TestAccSecurityLake_serial/DataLake/replication (74.20s)
        --- PASS: TestAccSecurityLake_serial/DataLake/basic (82.44s)
        --- PASS: TestAccSecurityLake_serial/DataLake/disappears (48.61s)
        --- PASS: TestAccSecurityLake_serial/DataLake/tags (65.78s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/securitylake	420.475s

Another set of resources using AutoFlex to ensure no regression:

% make testacc TESTARGS='-run=TestAccS3ControlAccessGrants_serial/Grant' PKG=s3control
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/s3control/... -v -count 1 -parallel 20  -run=TestAccS3ControlAccessGrants_serial/Grant -timeout 360m
=== RUN   TestAccS3ControlAccessGrants_serial
=== PAUSE TestAccS3ControlAccessGrants_serial
=== CONT  TestAccS3ControlAccessGrants_serial
=== RUN   TestAccS3ControlAccessGrants_serial/Grant
=== RUN   TestAccS3ControlAccessGrants_serial/Grant/basic
=== RUN   TestAccS3ControlAccessGrants_serial/Grant/disappears
=== RUN   TestAccS3ControlAccessGrants_serial/Grant/tags
=== RUN   TestAccS3ControlAccessGrants_serial/Grant/locationConfiguration
--- PASS: TestAccS3ControlAccessGrants_serial (227.76s)
    --- PASS: TestAccS3ControlAccessGrants_serial/Grant (227.76s)
        --- PASS: TestAccS3ControlAccessGrants_serial/Grant/basic (51.24s)
        --- PASS: TestAccS3ControlAccessGrants_serial/Grant/disappears (43.03s)
        --- PASS: TestAccS3ControlAccessGrants_serial/Grant/tags (84.71s)
        --- PASS: TestAccS3ControlAccessGrants_serial/Grant/locationConfiguration (48.79s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/s3control	233.249s

[github-actions]

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[github-actions]

This functionality has been released in v5.31.0 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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[github-actions]

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