Fix Arel visitor compatibility with Rails 8.1

[Krzysztof Adamski (rience)]

Summary

• Rails 8.1 removed the alias attribute from Arel::Nodes::Function and its subclasses (NamedFunction, Count, Avg, Max, Min, Sum, Exists)
• The ArelVisitorsDepthFirst visitor calls visit obj.alias on these nodes, causing NoMethodError: undefined method 'alias'
• Guard all three visit obj.alias calls with respond_to?(:alias) to support both Rails 8.0 and 8.1

Test plan

• Verify multi-tenant queries work on Rails 8.0
• Verify multi-tenant queries work on Rails 8.1

🤖 Generated with Claude Code

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