Bump version to 1.0.15 & mark as non-stable (#18797)

Author: wtgodbe

dir.props

@@ -155,12 +155,12 @@
     <ExternalExpectedPrerelease>servicing-25316-00</ExternalExpectedPrerelease>
 
     <!-- Central place to set the versions of all nuget packages produced in the repo -->
-    <Version Condition="'$(MSBuildProjectExtension)' == '.pkgproj' and '$(Version)' == ''">1.0.14</Version>
+    <Version Condition="'$(MSBuildProjectExtension)' == '.pkgproj' and '$(Version)' == ''">1.0.15</Version>
     <WindowsAPISetPackageVersion>1.0.1</WindowsAPISetPackageVersion>
     <Win8ArmPackageVersion>$(Version)-$(ExternalExpectedPrerelease)</Win8ArmPackageVersion>
 
     <!-- Set the boolean below to true to generate packages with stabilized versions -->
-    <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">true</StabilizePackageVersion>
+    <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>
     <StableVersion Condition="'$(MSBuildProjectExtension)' == '.pkgproj' and '$(StabilizePackageVersion)' == 'true' and '$(StableVersion)' == ''">$(Version)</StableVersion>
     <Win8ArmPackageVersion Condition="'$(StabilizePackageVersion)' == 'true'">$(StableVersion)</Win8ArmPackageVersion>