Only the library projects updates build numbers (#22554)

* Only the library projects updates build numbers

* ok

* better logging

* '

* why tho

* that is why

* wow

* metadata

* PreReleaseVersionLabel

* this is a bit better

eng/Versions.targets

@@ -25,7 +25,11 @@
     </SetVersionsDependsOn>
   </PropertyGroup>
 
-  <Target Name="SetVersions" BeforeTargets="$(SetVersionsBefore)" DependsOnTargets="$(SetVersionsDependsOn)" Returns="$(Version)">
+  <Target Name="SetVersions"
+          BeforeTargets="$(SetVersionsBefore)"
+          DependsOnTargets="$(SetVersionsDependsOn)"
+          Returns="$(Version)">
+
     <PropertyGroup>
       <PreReleaseVersionLabel Condition="$(CI) and '$(BUILD_REASON)' == 'Schedule'">$(NightlyTag)</PreReleaseVersionLabel>
     </PropertyGroup>
@@ -47,8 +51,20 @@
       <VSComponentVersion Condition="'$(PreReleaseVersionLabel)' == ''">$(MajorVersion).$(MinorVersion).$(PatchVersion).0</VSComponentVersion>
     </PropertyGroup>
 
+    <PropertyGroup>
+      <_SkipUpdateBuildNumber Condition="'$(SampleProject)' == 'true' or '$(OutputType)' == 'Exe' or '$(OutputType)' == 'WinExe' or '$(AndroidApplication)' == 'true' or '$(IsTestProject)' == 'true' or '$(IsPackable)' == 'false'">true</_SkipUpdateBuildNumber>
+      <_UpdateBuildNumber Condition="$(CI) and '$(BUILD_BUILDNUMBER)' != '$(PackageVersion)' AND '$(_SkipUpdateBuildNumber)' != 'true'">$(PackageVersion)</_UpdateBuildNumber>
+    </PropertyGroup>
+
+    <Error Condition="'$(_UpdateBuildNumber)' == '1.0.0'" Text="Unexpected _UpdateBuildNumber: '$(_UpdateBuildNumber)'" />
+
+    <PropertyGroup Condition="'$(_UpdateBuildNumber)' != ''">
+      <_UpdateBuildNumber Condition="'@(VersionMetadata)' != ''">$(_UpdateBuildNumber)+@(VersionMetadata -> '%(Identity)', '.')</_UpdateBuildNumber>
+    </PropertyGroup>
+
     <Message Condition="$(CI) and '$(BUILD_REASON)' == 'Schedule'" Importance="high" Text="##vso[build.addbuildtag]$(NightlyTag)"/>
-    <Message Condition="$(CI) and '$(BUILD_BUILDNUMBER)' != '$(PackageVersion)'" Importance="high" Text="##vso[build.updatebuildnumber]$(PackageVersion)"/>
+    <Message Condition="'$(_UpdateBuildNumber)' != ''" Importance="high" Text="##vso[build.updatebuildnumber]$(_UpdateBuildNumber)"/>
+
   </Target>
 
 </Project>