Auto redeploy pre env monthly

What does this MR do and why?

This MR solves gitlab-com/gl-infra/delivery#19836 (closed)

It build a new pipeline with the following steps:

1. Get the current auto-deploy version on grpd
2. Notify to Slack about the monthly pre deployment
3. Trigger an auto-deploy deployer pipeline to deploy the auto-deploy version in 1) to pre
4. Notify to Slack about the pipeline's status once it finished

Tests

• Pipeline: https://ops.gitlab.net/gitlab-org/release/tools/-/pipelines/2925753

Pipeline	Monthly Note
Link	Link

Author Check-list

• [-] Has documentation been updated?