Revert "Move a regression test out of CI (#80399)"

This reverts commit eb4d230.

Author: cshung

src/tests/GC/Regressions/Github/Runtime_76219/Runtime_76219.csproj

@@ -2,8 +2,6 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <Optimize>True</Optimize>
-    <!-- Move it out of CI for 78899 -->
-    <CLRTestPriority>1</CLRTestPriority>
 
     <!-- This test needs GCStress mode but it doesn't take long to execute
          so is fine to keep it in the inner loop -->

src/tests/issues.targets

@@ -66,9 +66,6 @@
         <ExcludeList Include="$(XunitTestBinBase)/Interop/MonoAPI/**">
             <Issue>CoreCLR does not implement the mono embedding API</Issue>
         </ExcludeList>
-        <ExcludeList Include="$(XunitTestBinBase)/GC/Regressions/Github/Runtime_76219/Runtime_76219/*">
-            <Issue>https://github.com/dotnet/runtime/issues/78899</Issue>
-        </ExcludeList>
         <ExcludeList Include="$(XunitTestBinBase)/readytorun/GenericCycleDetection/Depth3Test/*">
           <Issue>https://github.com/dotnet/runtime/issues/88586</Issue>
         </ExcludeList>