fix(helm): Evaluate init.extraContainers templates

[cin]

SUMMARY

Resolves #31877. This PR simply renders templates in init.extraContainers.

TESTING INSTRUCTIONS

Create an extraContainers config that contains templates that need to be rendered.

init:
  extraContainers:
    - name: test-container
      image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
      command: ["/bin/bash", "-c"]
...

ADDITIONAL INFORMATION

• [ x] Has associated issue: Fixes Evaluate Templates in init.extraContainers #31877
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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[villebro]

Hi @cin, a few questions:

• Is there some reason you'd only render templates for the init job, but not the other deployments?
• You will need to bump the chart version (I suggest installing the pre-commit hooks to automatically regenerate the Helm docs etc)

[cin]

I just went with the minimal set of changes initially. I just added rendering of the other deployments' extraContainers. Easy enough to remove if it's not needed. Just installed pre-commit and will look into its usage -- probably tomorrow.