Work CI-CD

- Set build components to preview.
- Set unit test to run with preview nanoCLR.

***NO_CI***

Author: josesimoes

.runsettings

@@ -12,5 +12,6 @@
    <nanoFrameworkAdapter>
        <Logging>Verbose</Logging>
        <IsRealHardware>False</IsRealHardware>
+       <UsePreviewClr>True</UsePreviewClr>
    </nanoFrameworkAdapter>
 </RunSettings>

azure-pipelines.yml

@@ -72,6 +72,7 @@ jobs:
       sonarCloudProject: 'nanoframework_lib-nanoFramework.System.Collections'
       runUnitTests: true
       unitTestRunsettings: '$(System.DefaultWorkingDirectory)\.runsettings'
+      usePreviewBuild: true
 
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 - job: Update_Dependents