[ISSUE-223] Pull secret element misplaced in pre upgrade CRD template

[rafalw82]

Purpose

Issue #223

imagePullSecrets element nested under containers instead of directly under spec level.

PR checklist

• Add link to the issue
• Choose Project
• Choose PR label
• New unit tests added
• Modified code has meaningful comments
• All TODOs are linked with the issues
• All comments are resolved

Testing

Upgrade with Values.global.registrySecret specified.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.41%. Comparing base (b69a72b) to head (0b0e043).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #224   +/-   ##
=======================================
  Coverage   60.41%   60.41%           
=======================================
  Files          10       10           
  Lines        1167     1167           
=======================================
  Hits          705      705           
  Misses        398      398           
  Partials       64       64           

Flag	Coverage Δ
unittests	60.41% <ø> (ø)

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