[lld] [llvm] [llvm-readobj][ELF] Alter JSON/LLVM output on note sections to allow for multiple notes per section in JSON (PR #96813)

[Roland McGrath via llvm-commits]

frobtech wrote:

It's unfortunate that this left the useless `Notesection` dictionary key in each element of the `NoteSections` list, rather than removing the useless dictionary layer consistent with the new `Notes` list.

https://github.com/llvm/llvm-project/pull/96813