Release v2 auto-deploy-image (Merge beta into master)

Description

We release official v2 image as the beta branch has been a while and no upcoming change is scheduled.

To create this MR, I basically did:

git checkout beta
git merge master

and resolve a few conflicts. Surprisingly, it was almost clean merge.

The point to check is whether we keep adding legacy stable chart repo (https://charts.helm.sh/stable) or stop adding it. This MR has still been adding it because it's the other type of breaking changes that not initially planned to be dropped in v2 release.

Close #125 (closed)

Reminder: we'll remove the beta branch later

Manual QA

• Updated: Wed Nov 18 08:30:29 UTC 2020
• Result: ✔

Auto Deploy dependencies setup

• Test project
• Deploy.gitlab-ci.yml
• auto-deploy-image (This branch's latest image)

Test Flow:

• Created a new Auto DevOps pipeline => ✔
• Canary Deployment job succeeded => ✔
• The canary ingress status is correctly fetched in Deploy Board. => ✔
• Promote canary to production => ✔
• Deploy Board shows only stable track pods => ✔