Result of `table.pack` is of a union instead of an intersection type

[Vftdan]

Currently, the type-checker complains about index accesses of a table.pack result inside condition branches that check that field n is not nil.

emmylua-analyzer-rust/crates/emmylua_code_analysis/resources/std/table.lua

Line 122 in 381d677

---@return [T...] | { n: integer }

should be instead:

---@return [T...] & { n: integer }