Bump the image version to 2.6.1 (apache#57)

Signed-off-by: xiaolong.ran [email protected]

Motivation
Follow release process and bump the image version to 2.6.1

Fix zookeeper antiaffinity (apache#52)

Fixes apache#39 

### Motivation

The match expression for the "app" label was incorrect breaking the antiaffinity since they would never match. Fixing this makes the podAntiAffinity work, but now requires at least N nodes to be in the cluster where N = largest replica set with affinity. Added the option to set the affinity type to preferredDuringSchedulingIgnoredDuringExecution where it will try to follow the affinity, but will still deploy a pod if it needs to break it. 

### Modifications

- Fixed app matchExpression 
- Added option to set the affinity type 
- bumped chart version

### Verifying this change

- [X] Make sure that the change passes the CI checks.

Fix deprecated values (apache#49)

Fixes apache#46

### Motivation

There were some templates that relied on extra values that are deprecated. 

### Modifications

Modified the checks to check for non deprecated values or deprecated values. 

### Verifying this change

- [X] Make sure that the change passes the CI checks.

Allow Grafana to work with a reverse proxy (apache#48)

### Motivation

Allow Grafana to be served from a sub path.  

### Modifications

- Added a config map to add extra environment variables to the grafana deployment. As the grafana image adds new features that require environment variables, this can be used to set them.
- Bumped the grafana image to allow a reverse proxy
- removed ingress annotations as they are specific to nginx, and to match all the other ingresses
- bumped the chart version as per the README 


Example values:
```
grafana:
  configData:
    GRAFANA_ROOT_URL: /pulsar/grafana
    GRAFANA_SERVE_FROM_SUB_PATH: "true"
  ingress:
      enabled: true
      port: 3000
      path: "/pulsar/grafana/?(.*)"
      annotations:
        nginx.ingress.kubernetes.io/rewrite-target: /$1
```

Release workflow should fetch all tags (apache#33)

*Motivation*

The helm chart release workflow should fetch all tags.

Release Pulsar Helm Chart - v2.5.0