Yml: Use rids instead of "Platform"

[ViktorHofer]

Currently we use a "Platform" layout instead of RID. Except for the delimiter and the casing, both formats are identical:

      targetRid: ios-arm64
      platform: iOS_arm64

Unfortunately for Windows this isn't true:

      targetRid: win-arm
      platform: Windows_NT_arm

Mono will publish the runtime targeting packs which contain the rid in the directory name as part of libraries's build-job.yml, hence the RID needs to be available. I suggest that we replace the made-up "Platform" format with the RID layout.

cc @safern @premun

[ghost]

Tagging subscribers to this area: @safern, @ViktorHofer
Notify danmosemsft if you want to be subscribed.

[safern]

I think this makes sense, but maybe should be part of: #32451 ?

[dotnet-policy-service]

Due to lack of recent activity, this issue has been marked as a candidate for backlog cleanup. It will be closed if no further activity occurs within 14 more days. Any new comment (by anyone, not necessarily the author) will undo this process.

This process is part of our issue cleanup automation.

[dotnet-policy-service]

This issue will now be closed since it had been marked no-recent-activity but received no further activity in the past 14 days. It is still possible to reopen or comment on the issue, but please note that the issue will be locked if it remains inactive for another 30 days.