feat(argo-cd): Adding ARGOCD_API_SERVER_REPLICAS environment variable

[bdun1013]

Resolves #2749 - Adding ARGOCD_API_SERVER_REPLICAS environment variable to server when autoscaling is not enabled

Checklist:

• [x] I have bumped the chart version according to versioning
• [x] I have updated the documentation according to documentation
• [x] I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• [x] Any new values are backwards compatible and/or have sensible default.
• [x] I have signed off all my commits as required by DCO.
• [x] My build is green (troubleshooting builds).