Revert "[MMTk/CI] Skip Ractor btests with MMTk"

This reverts commit 58b4e24.

The bug that it encountered was fixed in f76d407.

Author: peterzhu2118

.github/workflows/modgc.yml

@@ -120,7 +120,6 @@ jobs:
           echo 'MMTK_PLAN=${{ matrix.gc.mmtk_plan }}' >> $GITHUB_ENV
           echo 'EXCLUDES=../src/test/.excludes-mmtk' >> $GITHUB_ENV
           echo 'MSPECOPT=-B../src/spec/mmtk.mspec' >> $GITHUB_ENV
-          echo 'GITHUB_WORKFLOW=ModGC' >> $GITHUB_ENV
         if: ${{ matrix.gc.name == 'mmtk' }}
 
       - run: $SETARCH make

bootstraptest/test_ractor.rb

@@ -214,8 +214,8 @@
 ###
 ###
 # Ractor still has several memory corruption so skip huge number of tests
-if ENV['GITHUB_WORKFLOW'] == 'Compilations' || ENV['GITHUB_WORKFLOW'] == 'ModGC'
-  # ignore the follow
+if ENV['GITHUB_WORKFLOW'] == 'Compilations'
+   # ignore the follow
 else
 
 # Ractor.select(*ractors) receives a values from a ractors.