fix(helm): wrap extraContainers with tpl to evaluate templates (#31877)

All six deployment templates (beat, flower, worker, ws, node, init-job)
now evaluate extraContainers with `tpl` before rendering, matching the
existing pattern used for initContainers and extraVolumes. Bumps chart
version 0.15.5 → 0.15.6 per the chart versioning policy; regenerates
helm-docs README.

Co-authored-by: Craig Ingram <cin@users.noreply.github.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

helm/superset/Chart.yaml

@@ -29,7 +29,7 @@ maintainers:
   - name: craig-rueda
     email: craig@craigrueda.com
     url: https://github.com/craig-rueda
-version: 0.16.2 # See [README](https://github.com/apache/superset/blob/master/helm/superset/README.md#versioning) for version details.
+version: 0.16.3 # See [README](https://github.com/apache/superset/blob/master/helm/superset/README.md#versioning) for version details.
 dependencies:
   - name: postgresql
     version: 16.7.27

helm/superset/README.md

@@ -23,7 +23,7 @@ NOTE: This file is generated by helm-docs: https://github.com/norwoodj/helm-docs
 
 # superset
 
-![Version: 0.16.2](https://img.shields.io/badge/Version-0.16.2-informational?style=flat-square)
+![Version: 0.16.3](https://img.shields.io/badge/Version-0.16.3-informational?style=flat-square)
 
 Apache Superset is a modern, enterprise-ready business intelligence web application