fix issue accessing repo owner name (#221751)

## Summary

Fix accessor for repo name on github event passed to github action
causing [build
failure](4302602777),
also remove unused env for github labels.


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.github/workflows/trigger-chromium-build.yml

@@ -86,8 +86,7 @@ jobs:
               fi
           }
 
-          # attempt extracting puppeteer version bump config from the issue body, 
-          # single quote is very much intentional here so it's not escaped by bash
+          # attempt extracting puppeteer version bump config from the issue body
           echo "$ISSUE_BODY" | extract_code_blocks
       - name: Report multiple puppeteer_version properties
         if: ${{ steps.extract_version_bump_config.outputs.multiple_puppeteer_version_properties == 'true' }}
@@ -122,9 +121,8 @@ jobs:
           token: ${{ secrets.SHAREDUX_BUILDKITE_TOKEN }}
           pipeline: 'kibana-chromium-linux-build'
           env-vars: |
-            GITHUB_ISSUE_BASE_OWNER=${{ github.event.repository.owner.name }}
-            GITHUB_ISSUE_BASE_REPO=${{ github.event.repository.name }}/
+            GITHUB_ISSUE_BASE_OWNER=${{ github.event.repository.owner.login }}
+            GITHUB_ISSUE_BASE_REPO=${{ github.event.repository.name }}
             GITHUB_ISSUE_NUMBER=${{ github.event.issue.number }}
-            GITHUB_ISSUE_LABELS=${{ github.event.issue.labels }} | jq -r '. | map(.name) | join(",")'
             GITHUB_ISSUE_TRIGGER_USER=${{ github.event.issue.user.login }}
             PUPPETEER_VERSION=$(echo ${{ fromJSON(needs.matches_label.outputs.version_bump_config) }} | jq -r '.puppeteer_version')