[skip ci] avoids templating of pr body in oss pr migrate github action

.github/workflows/migrate-hge-pr.yml

@@ -33,7 +33,9 @@ jobs:
           core.setOutput('ossPrBaseSha', pr.data.base.sha);
           core.setOutput('ossPrTitle', pr.data.title);
           core.setOutput('ossPrUrl', pr.data.html_url);
-          core.setOutput('ossPrBody', pr.data.body);
+
+          const fs = require('fs');
+          fs.writeFileSync('pr-body.txt', pr.data.body);
 
     - name: Get all authors of the pull request
       uses: actions/github-script@v3
@@ -148,13 +150,15 @@ jobs:
       with:
         github-token: ${{secrets.HASURA_BOT_GH_TOKEN}}
         script: |
+          const fs = require('fs');
+          const prBody = fs.readFileSync('pr-body.txt', 'utf-8');
           const pr = await github.pulls.create({
             owner: 'hasura',
             repo: 'graphql-engine-mono',
             head: 'oss_pr_refs/pull/${{ github.event.inputs.ossPrNumber }}/head',
             base: 'main',
             title: '${{ steps.pr.outputs.ossPrTitle }}',
-            body: `This PR was migrated from ${{ steps.pr.outputs.ossPrUrl }} \n\n---\n${{ steps.pr.outputs.ossPrBody }}`
+            body: `This PR was migrated from ${{ steps.pr.outputs.ossPrUrl }} \n\n---\n` + prBody
           });
 
           console.log('Migrated PR in graphql-engine-mono = ', pr.data.html_url);