Avoid using twice hardcoded strings for the names of the Kube Secret keys, for AWS access/secret key vals

[matzew]

Fixes #

Proposed Changes

• as per title

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

[matzew]

/assign @pierDipi

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 64.27%. Comparing base (65da6fc) to head (c695150).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...er/integration/source/resources/containersource.go	0.00%	6 Missing ⚠️
...iler/integration/sink/resources/container_image.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8345   +/-   ##
=======================================
  Coverage   64.27%   64.27%           
=======================================
  Files         390      390           
  Lines       23279    23279           
=======================================
  Hits        14963    14963           
  Misses       7522     7522           
  Partials      794      794           

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[pierDipi]

/lgtm
/approve

[matzew]

/retest

[matzew]

/retest

[matzew]

/retest

[pierDipi]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[pierDipi]

/test unit-tests