[lld] [lld][WebAssembly] Allow `--trace-symbol` to work with symbols with custom import names (PR #96119)

[Heejin Ahn via llvm-commits]

https://github.com/aheejin commented:

- Is the intention to print the import name, not the internal name in tracing?
- `traceImport` seems to be added to `addUndefined[Function|Global|Tag]` but not `addUndefinedData`. Does `addUndefinedData` not need the tracing?

https://github.com/llvm/llvm-project/pull/96119