[PERF][MAUI] Update Maui builds to use dotnet rc1 and new dotnet version flow (#73624)

* Try getting the maui-version from the json and using the rc1 rollback versions.

* Update the rollback and maui-version links to their longterm versions.

* Add -L option to curl to follow the aka.ms link for the maui-version.json.

* Renamed maui-version.json to maui-supported-sdk-version.json to clarify it's use.

Author: LoopedBard3

eng/pipelines/coreclr/templates/build-perf-maui-apps-net7.yml

@@ -119,11 +119,12 @@ steps:
   - script: |
       curl -o NuGet.config 'https://raw.githubusercontent.com/dotnet/maui/main/NuGet.config'
       curl -o dotnet-install.sh 'https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh'
+      curl -Lo maui-supported-sdk-version.json 'https://aka.ms/dotnet/sdk/maui/net7.0.json'
+      version=$(sed -nr 's/\s*"version": "(.*)"/\1/p' ./maui-supported-sdk-version.json)
       chmod -R a+rx .
-      cp $(Build.SourcesDirectory)/src/tests/Common/maui/rollbackfile-net7.json ./rollbackfile-net7.json
-      ./dotnet-install.sh --version 7.0.100-preview.7.22376.5 --install-dir .
+      ./dotnet-install.sh --version $version --install-dir .
       ./dotnet --info
-      ./dotnet workload install maui --from-rollback-file rollbackfile-net7.json --configfile NuGet.config
+      ./dotnet workload install maui --from-rollback-file https://aka.ms/dotnet/maui/net7.0.json --configfile NuGet.config
     displayName: Install MAUI workload
     workingDirectory: $(Build.SourcesDirectory)