fix: use Buckets::Any for Values

Summarize the changes

• fix: use Buckets::Any for Values

• Earlier we returned empty buckets for Values/ValuesRow nodes and then choosed random bucket for execution if they were a subtree root.
• Buckets::Any provides the same semantics, use it instead and simplify empty_query_result function, which now always returns empty result.

Ensure that

• New code is covered by unit and integration tests.
• Related issues would be automatically closed with gitlab's closing pattern (Closes #issue_number).
• Public modules are documented (check the rendered version with cargo doc --open).
• (if PEST grammar has changed) EBNF grammar reflects these changes (check the result with railroad diagram generator.

Next steps

• Cherry-pick to: none
• Update sbroad submodule in picodata/picodata.
• (if EBNF grammar has changed) create a follow-up issue in picodata/docs.