[stable/cloudhealth-collector] Use correct `secretKeyRef.key` for API Token secret

[jacobboykin]

Description

• If a user installs this chart and sets the api_token value, the cloudhealth-colllector pod will fail to start due to the deployment config using the wrong secret key:
• https://github.com/deliveryhero/helm-charts/blob/master/stable/cloudhealth-collector/templates/deployment.yaml#L50
• https://github.com/deliveryhero/helm-charts/blob/master/stable/cloudhealth-collector/templates/secret.yaml#L10

Checklist

• [x] Title of the PR starts with chart name (e.g. [stable/mychartname])
• [x] I have read the contribution instructions, bumped chart version and regenerated the docs
• [ ] Github actions are passing

[max-rocket-internet]

Hi @jacobboykin 👋 Since the real environment variable that is used by Cloudhealth is called CHT_API_TOKEN, how about we rename all references to api_token? I think this would be more logical and consistent, right?

Also, you need to bump the chart version and update the chart readme from the templates 🙂

[github-actions[bot]]

This PR is stale because it has been open 14 days with no activity. Remove stale label or comment or this will be closed in 5 days.