Add RegexCharClass.Tables.cs to project file

Include the new generated file in the csproj to fix build failures

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

Author: Copilot

src/libraries/System.Text.RegularExpressions/src/System.Text.RegularExpressions.csproj

@@ -34,6 +34,7 @@
     <Compile Include="System\Text\RegularExpressions\RegexCaseEquivalences.Data.cs" />
     <Compile Include="System\Text\RegularExpressions\RegexCaseEquivalences.cs" />
     <Compile Include="System\Text\RegularExpressions\RegexCharClass.cs" />
+    <Compile Include="System\Text\RegularExpressions\RegexCharClass.Tables.cs" />
     <Compile Include="System\Text\RegularExpressions\RegexCompilationInfo.cs" />
     <Compile Include="System\Text\RegularExpressions\RegexFindOptimizations.cs" />
     <Compile Include="System\Text\RegularExpressions\GeneratedRegexAttribute.cs" />