fix(lambda): filterRule.null() returns empty array

[xazhao]

Issue # (if applicable)

Closes #31458.

Reason for this change

According to the documentation here, the FilterPattern should be [null]. However, the function FilterRule.null() currently returns an empty array [] instead. It results an invalid filter pattern definition.

Description of changes

Change the return value from [] to [null]

Description of how you validated changes

Add an integration test to validate the new return value. Also with the old return value, the deployment will fail with error Invalid request provided: Invalid filter pattern definition. so it should break existing customers.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

BREAKING CHANGE: The function return value changes from String[] to any which could be a breaking change in some cases. However, the previous return value would fail the deployment hence it reduces the risk of breaking change.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0800bd7
• Result: SUCCEEDED
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