[release-v1.14] backport Assert EventTypes references for IMC test (#7899)

[maschmid]

Backports knative#7899

• Assert EventTypes references for IMC and ContainerSource test
• Do not use ID as the attribute to match the event
  The id is different for each event when using container source. Use just the type, like other tests for container source.
• Fix type
• Remove test for ContainerSource EventType creation
  It is not supported.

[pierDipi]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 607aceb and 2 for PR HEAD 314a381 in total

[pierDipi]

11:16:00.235 INFO:    Create an image build for serverless-openshift-knative-operator
error: provided Dockerfile is not valid: Syntax error - can't find = in "Knative". Must be of the form: name=value

[openshift-ci]

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

Test name	Commit	Details	Required	Rerun command
ci/prow/413-test-encryption-auth-e2e-aws-413	314a381	link	true	/test 413-test-encryption-auth-e2e-aws-413
ci/prow/415-test-e2e-aws-415	314a381	link	true	/test 415-test-e2e-aws-415
ci/prow/415-test-conformance-aws-415	314a381	link	true	/test 415-test-conformance-aws-415

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 607aceb and 2 for PR HEAD 314a381 in total