Removes the local DCO action, adds a custom PR template, configures the inherited DCO action (#1317)

Signed-off-by: Miki <miki@amazon.com>

Signed-off-by: Miki <miki@amazon.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,10 @@
+### Description
+_Describe what this change achieves._
+
+### Issues Resolved
+_List any issues this PR will resolve, e.g. Closes [...]._
+
+
+### Checklist
+- [ ] By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the [Developers Certificate of Origin](https://github.com/opensearch-project/OpenSearch/blob/main/CONTRIBUTING.md#developer-certificate-of-origin).
+For more information on following Developer Certificate of Origin and signing off your commits, please check [here](https://github.com/opensearch-project/OpenSearch/blob/main/CONTRIBUTING.md#developer-certificate-of-origin).

.github/dco.yml

@@ -0,0 +1,2 @@
+require:
+  members: false

.github/workflows/dco.yml

@@ -1,18 +0,0 @@
-name: Developer Certificate of Origin Check
-
-on: [pull_request]
-
-jobs:
-  check:
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Get PR Commits
-      id: 'get-pr-commits'
-      uses: tim-actions/get-pr-commits@v1.1.0
-      with:
-        token: ${{ secrets.GITHUB_TOKEN }}
-    - name: DCO Check
-      uses: tim-actions/dco@v1.1.0
-      with:
-        commits: ${{ steps.get-pr-commits.outputs.commits }}