Remove 'beta' tag from prerelease version string (#41495)

Remove semantic versioning V1 flag as apparently this is not allowed in that format

Author: agocke

eng/Versions.props

@@ -8,9 +8,8 @@
     <MajorVersion>3</MajorVersion>
     <MinorVersion>6</MinorVersion>
     <PatchVersion>0</PatchVersion>
-    <PreReleaseVersionLabel>beta1</PreReleaseVersionLabel>
+    <PreReleaseVersionLabel>1</PreReleaseVersionLabel>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
-    <SemanticVersioningV1>true</SemanticVersioningV1>
     <!-- 
       By default the assembly version in official builds is "$(MajorVersion).$(MinorVersion).0.0".
       Keep the setting conditional. The toolset sets the assembly version to 42.42.42.42 if not set explicitly.