Extract duplicated list type handling logic into reusable helper

[Copilot]

Addresses code review feedback to eliminate duplicated logic for handling untyped zero-value lists that appear during import operations. The pattern was repeated identically in three locations within the anomaly detection job model conversion.

Changes

• Added EnsureTypedList helper in internal/utils/typeutils/list.go

  • Converts untyped zero-value lists (common during import) to properly typed null lists
  • Handles both nil element types and DynamicPseudoType elements
  • Returns list unchanged if already properly typed

• Refactored duplicate logic in models_tf.go for:

  • CategorizationFilters (StringType lists)
  • Influencers (StringType lists)
  • CustomRules (ObjectType lists)

• Removed unused import from resource.go

Before

if analysisConfigTF.CategorizationFilters.ElementType(ctx) == nil {
    analysisConfigTF.CategorizationFilters = types.ListNull(types.StringType)
} else if _, ok := analysisConfigTF.CategorizationFilters.ElementType(ctx).(basetypes.DynamicType); ok {
    analysisConfigTF.CategorizationFilters = types.ListNull(types.StringType)
}

After

analysisConfigTF.CategorizationFilters = typeutils.EnsureTypedList(ctx, analysisConfigTF.CategorizationFilters, types.StringType)

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