Empty list attributes cause perpetual diffs/replacements due to null vs [] mismatch

[cgeiaws]

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Closes #2993

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

No changes to security controls.

Description

This PR fixes perpetual diffs/replacements caused by empty list attributes being converted to null in Terraform state.

Problem

When a user configures an empty list (e.g., creator_member_abilities = []), the AWS API either:

1. Returns an empty array [], or
2. Omits the field entirely

The provider's translate.go was converting both cases to null in Terraform state. This caused a mismatch between the user's config ([]) and state (null), triggering RequiresReplaceIfConfigured() plan modifiers on every plan.

Solution

Modified internal/generic/translate.go to preserve empty lists/sets:

1. When AWS returns an empty array [], preserve it as an empty list instead of nil
2. When AWS omits a list/set field entirely, set it to empty [] instead of null

Testing

• Updated two unit tests in translate_test.go to expect empty lists instead of nil
• All existing unit tests pass

Affected Resources

This fix benefits any resource with optional list/set attributes, including:

• awscc_cleanrooms_collaboration (creator_member_abilities)
• awscc_cleanrooms_configured_table_association (configured_table_association_analysis_rules)
• Any other resource where users configure empty lists