[helm-chart] Adjust tag and pull policies for development branch

[yongfengdu]

From Sakari:
Regarding the Helm charts versions and image tags. We should do the following (in 1.1 for example):

Release (from release branch):
Helm chart version: 1.1
Image tag references in the charts: 1.1

Development (from main branch):
Helm chart version: 0-latest
Image tag references in the charts: latest

This way the user/developer can easily choose if they want to use release or development version. If they choose development (with 0-latest tag), they will always stay with the latest images (assuming we have the imagePullPolicy: always).

NOTE: 0-latest is valid SemVer tag

[yongfengdu]

Released version is fine with version 1.1.0 and use docker image with tag 1.1.
We'll change the helm chart version in main to "0-latest", and unset the imagePullPolicy to use the k8s' default behavior.