EKS Self-Hosted Installer: Update service environment variables to no longer use deprecated names

[MitchellGerdisch]

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Issue details

The EKS installer sets up environment variables for the API and Console services.
It is currently using some deprecated (but still supported) environment variable names for the service:

• PULUMI_OBJECTS_BUCKET
• PULUMI_POLICY_PACK_BUCKET
• MYSQL_ROOT_USERNAME
• MYSQL_ROOT_PASSWORD

All the environment variables set for the migrations, api, and console should be audited against the official list found on the docs pages for the given components: https://www.pulumi.com/docs/guides/self-hosted/components/

Affected area/feature