Rename onnxruntime-Linux-CPU-2019 machine pool to
"onnxruntime-Ubuntu2004-AMD-CPU". The old one has an internal error and
stuck there. I cannot make any change to it. It has been like this for
more than 1 week. So I created a new pool with the same setting except
the name is different.
Also, move some android pipelines to
"onnxruntime-Linux-CPU-For-Android-CI" which uses a standard image from
https://github.com/actions/runner-images
### Description
1. Move Linux CPU pipelines to an AMD CPU pool which is cheaper
2. Enable CCache for orttraining pipeline
### Motivation and Context
Azure AMD CPU machines are generally much cheaper than Intel CPU
machines. However, they don't have local disks.
