[clang] [flang] [llvm] [Offload] Rename and move 'clang-offload-packager' -> 'llvm-offload-binary' (PR #161438)

[Marco Elver via llvm-commits]

melver wrote:

There are references to the documentation left:
```
% git grep ClangOffloadPackager
clang/docs/ClangLinkerWrapper.rst:contains binary data created by the :doc:`ClangOffloadPackager`. The extracted
clang/docs/index.rst:   ClangOffloadPackager
```

```
Warning, treated as error:
/home/runner/work/llvm-project/llvm-project/clang-build/tools/clang/docs/index.rst:95:toctree contains reference to nonexisting document 'ClangOffloadPackager'
[475/476] Generating html Sphinx documentation for clang into "/home/runner/work/llvm-project/llvm-project/clang-build/tools/clang/docs/html"
FAILED: [code=2] tools/clang/docs/CMakeFiles/docs-clang-html /home/runner/work/llvm-project/llvm-project/clang-build/tools/clang/docs/CMakeFiles/docs-clang-html 
cd /home/runner/work/llvm-project/llvm-project/clang-build/tools/clang/docs && /usr/local/bin/cmake -E env /opt/hostedtoolcache/Python/3.13.7/x64/bin/sphinx-build -b html -d /home/runner/work/llvm-project/llvm-project/clang-build/tools/clang/docs/_doctrees-clang-html -q -t builder-html -D version=22 -D release=22.0.0git -tPreRelease -W /home/runner/work/llvm-project/llvm-project/clang-build/tools/clang/docs /home/runner/work/llvm-project/llvm-project/clang-build/tools/clang/docs/html
```

https://github.com/llvm/llvm-project/pull/161438