[JuliaLowering] Fix and test quoting in getproperty (#61541)
Fix https://github.com/JuliaLang/JuliaLowering.jl/issues/168. Note that
quoting still needs more thought, but this change takes the conservative
approach where `(inert K"Identifier")` == `(inert_syntaxtree
K"Identifier")` == `K"Symbol"`.
