use progressive JSON unmarshalling for secret decoding

[cheesesashimi]

- What I did

This refactors the DockerConfigJSON / DockerConfig secret decoding process to
an implementation which does partial JSON decoding before determining what to
do.

This adds additional test cases for K8s secret decoding since I ran into
what I thought was a bug when trying to write additional test cases for
the new SysContext helper.

- How to verify it

No behavioral changes should occur with this change, meaning that the E2E test suites should be able to exercise and validate this code path correctly.

- Description for the changelog
Use partial JSON decoding for secrets helper

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cheesesashimi

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