[llvm] [llvm-objcopy] Add --skip-symbol and --skip-symbols options (PR #80873)

[Ilia Kuklin via llvm-commits]

kuilpd wrote:

> https://sourceware.org/bugzilla/show_bug.cgi?id=31000#c3 Nick has a comment whether we really need a filename variant option, since we can just use `@xxx`

I added it to make it consistent with other options, pretty much all of them have a separate option to read symbols from a file. If someone wants, they can certainly use response files, but I don't know if it warrants the removal of these file reading options.

https://github.com/llvm/llvm-project/pull/80873