Merge aiinfra-linux-ARM64-CPU-2019 and onnxruntime-linux-ARM64-CPU-2019 (#18069)

### Description
Merge aiinfra-linux-ARM64-CPU-2019 and onnxruntime-linux-ARM64-CPU-2019
machines to a single one to ease management.

Author: snnn

tools/ci_build/github/azure-pipelines/py-package-test-pipeline.yml

@@ -30,7 +30,7 @@ stages:
   - template: templates/py-packaging-linux-test-cpu.yml
     parameters:
       arch: 'aarch64'
-      machine_pool: 'aiinfra-linux-ARM64-CPU-2019'
+      machine_pool: 'onnxruntime-linux-ARM64-CPU-2019'
       base_image: 'arm64v8/almalinux:8'
       devtoolset_rootpath: /opt/rh/gcc-toolset-12/root
       ld_library_path_arg: /opt/rh/gcc-toolset-12/root/usr/lib64:/opt/rh/gcc-toolset-12/root/usr/lib:/opt/rh/gcc-toolset-12/root/usr/lib64/dyninst:/opt/rh/gcc-toolset-12/root/usr/lib/dyninst:/usr/local/lib64

tools/ci_build/github/azure-pipelines/templates/linux-cpu-packaging-pipeline.yml

@@ -47,7 +47,7 @@ stages:
       OnnxruntimeCFlags: '-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -fstack-clash-protection -O3 -Wl,--strip-all'
       OnnxruntimeCXXFlags: '-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -fstack-clash-protection -O3 -Wl,--strip-all'
       OnnxruntimeNodejsBindingArch: 'arm64'
-      PoolName: 'aiinfra-linux-ARM64-CPU-2019'
+      PoolName: 'onnxruntime-linux-ARM64-CPU-2019'
       ArtifactNamePrefix: ${{ parameters.ArtifactNamePrefix }}
       PackageJava: ${{ parameters.PackageJava }}
       PackageNodeJS: ${{ parameters.PackageNodeJS }}

tools/ci_build/github/azure-pipelines/templates/py-packaging-stage.yml

@@ -484,7 +484,7 @@ stages:
       - template: py-linux.yml
         parameters:
           arch: 'aarch64'
-          machine_pool: 'aiinfra-linux-ARM64-CPU-2019'
+          machine_pool: 'onnxruntime-linux-ARM64-CPU-2019'
           base_image: 'arm64v8/almalinux:8'
           devtoolset_rootpath: /opt/rh/gcc-toolset-12/root
           ld_library_path_arg: /opt/rh/gcc-toolset-12/root/usr/lib64:/opt/rh/gcc-toolset-12/root/usr/lib:/opt/rh/gcc-toolset-12/root/usr/lib64/dyninst:/opt/rh/gcc-toolset-12/root/usr/lib/dyninst:/usr/local/lib64