Prepare Core-Setup for repo consolidation (dotnet/core-setup#8709)

Commit migrated from https://github.com/dotnet/core-setup/commit/fd3b3421d7b901aaac28ad34e63b6480f88973d3

Commit migrated from https://github.com/dotnet/core-setup/commit/c66b5cabce09f18f472b97c29bea267fbdd6136a

* Copy ExecWithRetries from BuildTools

Adds working dir, log importance to ExecWithRetries. Also Inline attemptMessage and add log importance comment.

* Add WindowsDesktop sfx bundle installer, refactor

Adds bundle creation support to the packaging-tools, and factors the framework pack and runtime WiX files into a single, more flexible, "product" set of WiX files.

The old MSI generation directory is removed entirely: with the new "product" WiX files, the host and hostfxr MSI creation can move to the new system. The VS insertion nupkg generation code is also ported from PowerShell to MSBuild to fit the new system.

The old system is still used for some macOS pkgs and the macOS bundle installer, some Debian/RPM packages, and some tarballs/zips.


Commit migrated from https://github.com/dotnet/core-setup/commit/ccf0024ba099103a5b759613c48b8cd46af8754a

Arcade SDK doesn't support signing the containers that this repo produces, so this commit adds a structure that allows projects to depend on signed assets. This involves adding signing/*.proj projects for other projects to depend on, and implementing signing in a way that allows multiple passes.


Commit migrated from https://github.com/dotnet/core-setup/commit/29414edc1132925e64e703f377b308695c5b64ba