Stop passing the CI App key to the shared design gate

The shared gate now runs every write on the job's GITHUB_TOKEN, which
pull_request_target grants the declared write permissions even for fork
PRs. The org CI App key can read every private repository, so public
repositories should not hand it to any workflow.

Author: ualtinok

.github/workflows/design-gate.yml

@@ -14,6 +14,3 @@ jobs:
       pull-requests: write # gate comment, draft conversion, ready for review
       checks: write # publish the design-gate check run
     uses: cortexkit/subconscious/.github/workflows/design-gate.yml@master
-    secrets:
-      CK_CI_APP_ID: ${{ secrets.CK_CI_APP_ID }}
-      CK_CI_APP_PRIVATE_KEY: ${{ secrets.CK_CI_APP_PRIVATE_KEY }}