[chore] Do not generate SSL env vars for each struct entry, just once per containersource/image

[matzew]

Proposed Changes

• just call the generation of SSL env-vars once, not for each provided property

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[pierDipi]

/lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.58%. Comparing base (35d8c63) to head (ef9b855).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8315   +/-   ##
=======================================
  Coverage   64.58%   64.58%           
=======================================
  Files         373      373           
  Lines       22619    22619           
=======================================
  Hits        14609    14609           
  Misses       7244     7244           
  Partials      766      766           

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[matzew]

/test unit-tests

[knative-prow]

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: christophd, matzew, pierDipi

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