Move macOS build jobs to a dedicated pool (#26252)
### Description
Move packaging pipelines' macOS build jobs to a new machine pool that is
much faster, which can reduce the build time by 85%.
However, it has some drawbacks:
1. It does not have Java installed. Also, ADO's JavaToolInstaller task
does not support macOS. So I have to remove these things from the
pipeline. We will stop providing java binaries for macOS until this
issue is resolved.
2. It does not Cocoapod. But Cocoapod itself is being deprecated. So it
is not a big deal.
