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fix(helm/v2-alpha): Support custom container names and fix templating bugs

This PR adds support for custom container names via
kubectl.kubernetes.io/default-container annotation and fixes two
critical bugs found during testing:

1. Container names were being incorrectly templated by
   substituteResourceNamesWithPrefix. Container names are internal
   pod identifiers and should remain literal, not templated like
   cluster-wide resource names.

2. Image templating failed due to order-of-operations issue where
   substituteResourceNamesWithPrefix runs before templateImageReference.
   Modified all image-related functions to check for both literal and
   templated container names.

Testing: Verified with custom container names (controller-test) and
ensures backward compatibility with default 'manager' container name.