chore: Use noreply for va-vsp-bot email

- Do not use @va.gov email address
- Instead use a `noreply` email address
- Per https://github.com/orgs/department-of-veterans-affairs/discussions/13
  - This technically only applies to public repos, but consistency across all repos is appreciated

.github/workflows/preview-environment-cleanup.yml

@@ -55,7 +55,7 @@ jobs:
         uses: EndBug/add-and-commit@1bad3abcf0d6ec49a5857d124b0bfb52dc7bb081 # 9.1.3
         with:
           author_name: va-vsp-bot
-          author_email: devops@va.gov
+          author_email: 70344339+va-vsp-bot@users.noreply.github.com
           branch: main
           cwd: manifests/apps/preview-environment/dev/
           add: 'pe-envs'
@@ -66,7 +66,7 @@ jobs:
         uses: EndBug/add-and-commit@1bad3abcf0d6ec49a5857d124b0bfb52dc7bb081 # 9.1.3
         with:
           author_name: va-vsp-bot
-          author_email: devops@va.gov
+          author_email: 70344339+va-vsp-bot@users.noreply.github.com
           branch: main
           cwd: manifests/apps/preview-environment/dev/
           add: 'argocd-apps'