Move etc under detection_rules (#1885)

* Move etc directory under detection_rules
* Prepend original `etc` path with `detection_rules`
* Update docstrings in util and CODEOWNERS
* Add resiliency to tags to account for the old directory structure
* Bug fix: remove unused param caused by commit 6ed1a39efe

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

Removed changes from:
- etc/packages.yml

(selectively cherry picked from commit 6219fc06b9)

.github/workflows/lock-versions.yml

@@ -49,8 +49,8 @@ jobs:
         env:
           BRANCHES: "${{github.event.inputs.branches}}"
         run: |
-          ./etc/lock-multiple.sh $BRANCHES
-          git add etc/version.lock.json
+          ./detection_rules/etc/lock-multiple.sh $BRANCHES
+          git add detection_rules/etc/version.lock.json
 
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v3