[ENHANCEMENT] explore creating schema validation for env keys in values.yaml

[hamza-m-masood]

Describe the use case:

Continuation of #2475
The schema is already added for 8.7 chart.
Explore if this schema can be enhanced for validating the env keys in the values.yaml

Describe the enhancement/feature:

For example, this could be implemented by copying the k8s pod env schema using post-rendering after generating the chart and pasting it into the corresponding chart components env for the schema to validate the env keys.

Desired outcome and acceptance tests:

If an incorrect env key is provided then the schema should result in an error.