### Description
1. Remove Linux jobs for ORT-Extension combined build
2. Add a macOS build job for ORT-Extension combined build
3. Adjust the yaml file so that it can support two different ADO
instances.
### Motivation and Context
To test our code better. And it will enable us to run such tests for
every commit in the main branch. It would be easier for us to figure out
which change caused a build break.
See
[AB#13435](https://aiinfra.visualstudio.com/6a833879-cd9b-44a4-a9de-adc2d818f13c/_workitems/edit/13435)
### Description
BUG FIX: the if...else in telemetry-steps.yml does not really work. It
always says "Telemetry is disabled." even through the pipeline doesn't
have the pipeline variable.
### Motivation and Context
For example, recently I setup a new pipeline in
https://dev.azure.com/onnxruntime/onnxruntime/_build without setting the
ADO variable, but the powershell code still thinks that we have enabled
telemetry.
See:
https://dev.azure.com/onnxruntime/onnxruntime/_build/results?buildId=910107&view=results
The reason it didn't work because when the pipeline
variable("TELEMETRYGUID") doesn't exist, the occurrence of
"$(TELEMETRYGUID)" would be not replace to anything. It will remain as
it is.
