drop eventing-rabbitmq downstream testing

[dprotaso]

Part of knative/eventing#7670

/assign @izabelacg
/cc @pierDipi

[knative-prow]

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[dprotaso]

@pierDipi unsure if there are other eventing integrations that don't need to be tested anymore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9f033a7) 81.80% compared to head (2bb52a3) 81.80%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2969   +/-   ##
=======================================
  Coverage   81.80%   81.80%           
=======================================
  Files         167      167           
  Lines       10231    10231           
=======================================
  Hits         8369     8369           
  Misses       1614     1614           
  Partials      248      248           

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[izabelacg]

/lgtm