Refactor Yaml files with parameters towards Helm packages

[LaurentLesle]

Current deployment of the longhall applications are performed by calling the yaml file directly. During the deployment there is a need to set some variables to specific values.

The purpose of this issue is to refactor the yaml towards a helm package and call the helm package during the deployment to inject value at deployment time.

Example:
https://github.com/dapr/test-infra/blob/master/.github/workflows/feed-generator-build.yml

Projects impacted:

• feed-generator
• hashtag-actor
• hashtag-counter
• message-analyzer
• snapshot
• validation-worker

Acceptance criteria per project:

• helm package created and stored on the helm registry
• github workflow refactored to call the helm package