update helm chart generator to treat config.yaml as yaml in values

[echozio]

This addresses some of the concerns raised in #1138 and leaves the contents of config.yaml as YAML in values.yaml, enabling users to change a single value without the need to copy the rest of its contents over to their own values.

Users already using a string for their config.yaml value should not be affected, as the template partial responsible for rendering the data treats any top-level string value as before. This behavior was also necessary to retain in order to render the ConfigMaps with non-YAML data.

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• All commits in the PR are squashed. More info
• The PR is made into dedicated next-release branch, not into master branch¹. More info
• The PR is signed. More info

[Slach]

thanks for contribution
hope not so much users used config.yml provided as string