[CI] Add label and check-commit automation

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you very much for your pull request to the OpenCTI project! We as a community
+driven project depend on support and contributions like this!
+
+Thus already a BIG THANK YOU upfront to you for choosing to help with your PR.
+-->
+
+### Proposed changes
+
+*
+
+### Related issues
+
+*
+

.github/workflows/auto-set-labels.yml

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+name: Assign label Filigran team on PR from an organization
+on: pull_request
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setting labels
+        uses: FiligranHQ/[email protected]
+        with:
+          labels_by_organization: "{\"FiligranHQ\":[\"filigran team\"]}"

.github/workflows/check-verified-commit.yml

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+name: Check signed commits in PR 
+on: [pull_request,pull_request_target]
+jobs:
+  check-signed-commits:
+    name: Check signed commits in PR
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+    - name: Information about how to sign commits see https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits
+      # "with comment" below does not work for forks.
+      run: |
+        echo "If you need to sign commits, Please see https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits"
+    - name: Check signed commits in PR on fail see above information.
+      uses: 1Password/check-signed-commits-action@v1
+      with:
+        comment: |
+          Thank you for your contribution, but we need you to sign your commits. Please see https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits