Bump main versioning to preview1 (#111880)

Author: carlossanlop

eng/Versions.props

@@ -11,7 +11,7 @@
     <PackageVersionNet8>8.0.8</PackageVersionNet8>
     <PackageVersionNet7>7.0.20</PackageVersionNet7>
     <PackageVersionNet6>6.0.$([MSBuild]::Add($([System.Version]::Parse('$(PackageVersionNet8)').Build),25))</PackageVersionNet6>
-    <PreReleaseVersionLabel>alpha</PreReleaseVersionLabel>
+    <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
     <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
     <!-- Enable to remove prerelease label. -->
     <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>