[release/v7.4.16] Add macOS binary code signing and package notarization by adityapatwardhan · Pull Request #27431 · PowerShell/PowerShell

We still need to apply the template signing so that Guardian tasks pass
and so that script files are signed. After doing what's essentially
Windows signing, we sign and harden the binaries for macOS. Then we do
the same for the PKG installer, and finally notarize it. The ESRP
signing service requires a zip of files for Apple signing at all stages.
Now that we can use it via the OneBranch signing task we no longer need
the service connection or variable group that was trying to set it up.
Notarization requires the BundleId from Get-MacOSPackageIdentifierInfo.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>