Refactor the dedupe workflow by extracting a reusable workflow to opensearch-build (#5319)

* Refactor issue dedupe workflows to call reusable workflow

Replace inline workflow logic in all three issue dedup files with thin
callers to opensearch-project/opensearch-build/.github/workflows/issue-dedupe.yml@main.
This centralizes the dedupe logic (detect, auto-close, remove-label) into
a single reusable workflow, reducing per-repo maintenance burden.

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Temporarily point dedupe workflows to personal fork for testing

Point reusable workflow references to qianheng-aws/opensearch-build
branch add-issue-dedupe-workflow until the upstream PR is merged.

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Refactor dedupe workflows to use opensearch-build reusable workflows

- Three caller workflows now delegate to opensearch-build reusable workflows
- Remove .claude/commands/dedupe.md (prompt now lives in opensearch-build)
- Remove scripts/comment-on-duplicates.sh (logic inlined in reusable workflow)

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Test: point dedupe detect to test-dedupe-debug branch

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Point dedupe detect to PR branch for testing

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Simplify dedupe callers after reusable workflow input cleanup

Remove redundant parameter passing — reusable workflows now derive
issue context from github.event directly.

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Update dedupe caller to match latest reusable workflow changes

- Point to opensearch-project/opensearch-build@main
- Rename secret to BEDROCK_ACCESS_ROLE_ISSUE
- Add schedule trigger and auto-close job
- Remove workflow_dispatch (detect derives issue from github.event)

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Rename dedupe workflow to remove tool-specific naming

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Add dispatch for dedupe workflow

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Add workflow_dispatch support for auto-close job

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Point dedupe workflows to fork branch for testing

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Consolidate dedupe workflows and add grace_days to auto-close

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Pass grace_days to detect workflow via repo variable

Signed-off-by: Heng Qian <qianheng@amazon.com>

* Point dedupe workflows to upstream main and update secret name

Signed-off-by: Heng Qian <qianheng@amazon.com>

---------

Signed-off-by: Heng Qian <qianheng@amazon.com>

Author: qianheng-aws

.claude/commands/dedupe.md

@@ -0,0 +1,43 @@
+---
+name: Issue Dedupe
+on:
+  issues:
+    types: [opened]
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+    inputs:
+      job:
+        description: 'Job to run'
+        required: true
+        type: choice
+        options:
+          - detect
+          - auto-close
+        default: detect
+      issue_number:
+        description: 'Issue number to check for duplicates (detect only)'
+        required: false
+        type: string
+
+jobs:
+  detect:
+    if: github.event_name == 'issues' || (github.event_name == 'workflow_dispatch' && inputs.job == 'detect')
+    uses: opensearch-project/opensearch-build/.github/workflows/issue-dedupe-detect.yml@main
+    permissions:
+      contents: read
+      issues: write
+      id-token: write
+    secrets:
+      BEDROCK_ACCESS_ROLE_ISSUE_DEDUPE: ${{ secrets.BEDROCK_ACCESS_ROLE_ISSUE_DEDUPE }}
+    with:
+      issue_number: ${{ inputs.issue_number || '' }}
+      grace_days: ${{ vars.DUPLICATE_GRACE_DAYS || '7' }}
+
+  auto-close:
+    if: github.event_name == 'schedule' || (github.event_name == 'workflow_dispatch' && inputs.job == 'auto-close')
+    uses: opensearch-project/opensearch-build/.github/workflows/issue-dedupe-autoclose.yml@main
+    permissions:
+      issues: write
+    with:
+      grace_days: ${{ vars.DUPLICATE_GRACE_DAYS || '7' }}