integrationsource/integrationsink AWS e2e tests

[simkam]

This is my first ever golang contribution (obviously also the first using reconciler-test framework) so I would appreciate throught review and some patience.

This adds new tag for e2e tests called e2e_aws that runs tests for integrationsink/integrationsource resources that use AWS services. See updated test/rekt/README.md for all details.

New tests (tag) pass locally and we will run them in an internal Jenkins. We can consider also including them in GH CI.

Usual disclamer nowadays - written with help by AI - Google Gemini and Claude Code.

depends on #8851 fixing linting errors

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: simkam
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[knative-prow]

There are empty aliases in OWNER_ALIASES, cleanup is advised.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.13%. Comparing base (59b517c) to head (2ab06a5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8849      +/-   ##
==========================================
+ Coverage   51.12%   51.13%   +0.01%     
==========================================
  Files         409      409              
  Lines       21369    21369              
==========================================
+ Hits        10925    10928       +3     
+ Misses       9592     9588       -4     
- Partials      852      853       +1     

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[knative-prow]

@simkam: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
reconciler-tests_eventing_main	2ab06a5	link	true	/test reconciler-tests

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