chore: Remove signature verification step from GitHub Actions

This commit removes the 'Verify Signatures' step from the GitHub Actions
workflow as it was specifically testing for rego signatures, which are no
longer supported in the project.

.github/workflows/pr.yaml

@@ -161,27 +161,6 @@ jobs:
         run: |
           make check-err
   #
-  # SIGNATURES CODE VERIFICATION
-  #
-  verify-signatures:
-    name: Verify Signatures
-    needs:
-      - verify-analyze-code
-    runs-on: ubuntu-22.04
-    steps:
-      - name: Checkout Code
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-        with:
-          submodules: true
-      - name: Install Dependencies
-        uses: ./.github/actions/build-dependencies
-      - name: Build Signatures
-        run: |
-          make signatures
-      - name: Test Signatures
-        run: |
-          make test-signatures
-  #
   # TOOLS BUILD VERIFICATION
   #
   verify-tools: