Update TrimmingEnable+NullableEnable to avoid unnecessary warning

build/NullableEnable.props

@@ -1,11 +1,11 @@
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <!-- 
     The Nullable annotations on netstandard2.0 are incomplete and incorrect in places. Ignore
-    nullable warnings on netstandard2.0 and make them errors on later target frameworks.
+    nullable warnings before .NET 6 and make them errors on later target frameworks.
   -->
   <PropertyGroup>
     <Nullable>enable</Nullable>
-    <WarningsAsErrors Condition="'$(TargetFramework)' != 'netstandard2.0'">$(WarningsAsErrors);nullable</WarningsAsErrors>
+    <WarningsAsErrors Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">$(WarningsAsErrors);nullable</WarningsAsErrors>
-    <NoWarn Condition="'$(TargetFramework)' == 'netstandard2.0'">$(NoWarn);nullable</NoWarn>
+    <NoWarn Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">$(NoWarn);nullable</NoWarn>
   </PropertyGroup>
 </Project>

build/TrimmingEnable.props

@@ -1,14 +1,18 @@
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
-  <PropertyGroup>
+  <PropertyGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">
     <SuppressTrimAnalysisWarnings>false</SuppressTrimAnalysisWarnings>
     <EnableTrimAnalyzer>true</EnableTrimAnalyzer>
     <TrimmerSingleWarn>false</TrimmerSingleWarn>
     <IsTrimmable>true</IsTrimmable>
   </PropertyGroup>
 
+  <PropertyGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))">
+    <IsAotCompatible>true</IsAotCompatible>
+  </PropertyGroup>
+
   <!-- Remove check for the AOT when we get rid of dependencies with reflection -->
-  <PropertyGroup Condition="'$(TargetFramework)' != 'netstandard2.0' and '$(PublishAot)' != 'true'">
+  <PropertyGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0')) and '$(PublishAot)' != 'true'">
     <ILLinkTreatWarningsAsErrors>true</ILLinkTreatWarningsAsErrors>
     <!-- Trim warnings -->
     <WarningsAsErrors>$(WarningsAsErrors);IL2000;IL2001;IL2002;IL2003;IL2004;IL2005;IL2006;IL2007;IL2008;IL2009;IL2010;IL2011;IL2012;IL2013;IL2014;IL2015;IL2016;IL2017;IL2018;IL2019;IL2020;IL2021;IL2022;IL2023;IL2024;IL2025;IL2026;IL2027;IL2028;IL2029;IL2030;IL2031;IL2032;IL2033;IL2034;IL2035;IL2036;IL2037;IL2038;IL2039;IL2040;IL2041;IL2042;IL2043;IL2044;IL2045;IL2046;IL2047;IL2048;IL2049;IL2050;IL2051;IL2052;IL2053;IL2054;IL2055;IL2056;IL2057;IL2058;IL2059;IL2060;IL2061;IL2062;IL2063;IL2064;IL2065;IL2066;IL2067;IL2068;IL2069;IL2070;IL2071;IL2072;IL2073;IL2074;IL2075;IL2076;IL2077;IL2078;IL2079;IL2080;IL2081;IL2082;IL2083;IL2084;IL2085;IL2086;IL2087;IL2088;IL2089;IL2090;IL2091;IL2092;IL2093;IL2094;IL2095;IL2096;IL2097;IL2098;IL2099;IL2100;IL2101;IL2102;IL2103;IL2104;IL2105;IL2106;IL2107;IL2108;IL2109;IL2110;IL2111;IL2112;IL2113;IL2114;IL2115;IL2116;IL2117;IL2118;IL2119;IL2120;IL2121;IL2122;IL2123;IL2124;IL2125;IL2126;IL2127;IL2128;IL2129;IL2130;IL2131;IL2132;IL2133;IL2134;IL2135;IL2136;IL2137;IL2138;IL2139;IL2140;IL2141;IL2142;IL2143;IL2144;IL2145;IL2146;IL2147;IL2148;IL2149;IL2150;IL2151;IL2152;IL2153;IL2154;IL2155;IL2156;IL2157</WarningsAsErrors>
@@ -16,10 +20,4 @@
     <WarningsAsErrors>$(WarningsAsErrors);IL3050;IL3051;IL3052;IL3053;IL3054;IL3055;IL3056</WarningsAsErrors>
   </PropertyGroup>
 
-  <!-- UnconditionalSuppressMessage doesn't work correctly with .NET Standard, keep trim warnings in .NET only -->
-  <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <SuppressTrimAnalysisWarnings>true</SuppressTrimAnalysisWarnings>
-    <EnableTrimAnalyzer>false</EnableTrimAnalyzer>
-  </PropertyGroup>
-
 </Project>