Various changes/bugfixes to chart/code to streamline deployment on different forms of infra

[seanshi-scale]

• Add DB_SECRET_AWS_PROFILE to templates, this is needed in the db init job
• Allow db init job to be run even if you're reading dbcreds from an AWS secret
• Allow optionally creating image builder + inference serviceaccounts
• Parametrize some ECR repo names in the endpoint builder
• Allow the refresh codeartifact creds script to not run if the script isn't there
• Fix a bug with initializing the k8s autoscaling client

Test: installed in a separate VPC