remove configMap k8s Helm dependency

[rogercoll]

Changes

1. Bump demo images to 1.11.4
2. Remove the manual confimap deployment in favor of Helm variables (alternateConfig for the opentelemetry-demo Chart and config for the collector Chart)

Merge Requirements

For new features contributions, please make sure you have completed the following
essential items:

• CHANGELOG.md updated to document new feature additions
• Appropriate documentation updates in the docs
• Appropriate Helm chart updates in the helm-charts

Maintainers will not merge until the above have been completed. If you're unsure
which docs need to be changed ping the
@open-telemetry/demo-approvers.