Auto merge of #12490 - yue4u:fix/show-enum-in-fresh-use-tree, r=Veykril

fix: complete non-std enum at the start of `use` completions

close: #12421

diff --cc crates/ide-completion/src/completions/use_.rs
Simple merge

diff --cc crates/ide-completion/src/tests/use_tree.rs
Simple merge