Migrate remaining tests using ld.gold to ld.bfd

After https://github.com/llvm/llvm-project/pull/130981 there are still a few tests using ld.gold due to bugs in ld.bfd:

* Common symbol handling: https://sourceware.org/bugzilla/show_bug.cgi?id=34570
* `--start-lib`/`--end-lib` support: https://sourceware.org/bugzilla/show_bug.cgi?id=34572

These have already been fixed, but not released yet. Once they are part of a release, we should migrate the remaining gold plugin tests to use ld.bfd.

Start by locating the remaining gold plugin tests that still select ld.gold, then check whether releases containing the ld.bfd fixes for common symbols and --start-lib/--end-lib are available. Done means the remaining tests use ld.bfd and pass without relying on unreleased linker fixes.

Written by the indexing model from the issue text.