Issue with Arduino tests

Recently Arduino tests started failing with:

Error during build: Platform 'esp32:esp32' not found: platform not installed
Try running `arduino-cli.exe core install esp32:esp32`

It could be specific to some machines.

These tests are disabled here: https://github.com/dotnet/iot/pull/2051

https://github.com/dotnet/iot/blob/e12acc2a629e23daa6c4b3a5c15349450f6ffc6b/azure-pipelines.yml#L93-L113

[joperezr]

tests are one thing, but I think I agree with @krwq on disabling Arduino specific build. We have talked about this several times during triage, but essentially the purpose of CI is to ensure and protect against build breaks from the incoming code. Given that the Arduino binding (and other code that might impact it) are very rarely touched, having this leg as part of the build is not really giving us much benefit. In other words, I don’t think this build has ever failed due to a legitimate break in the Arduino binding, except for PRs that were actually touching it which was mostly just work done by @pgrawehr. In the past we had agreed we would move this pipeline to a separate leg that can be invoked on-demand, so I see the change @krwq made on #2051 as part of that process, we just now need to create a new yml and move this code there. After that we can just create a new pipeline that runs on demand.

[Ellerbach]

[Triage] Closing as disabled because they were running for too long and they are anyway run locally when touching the library.