Eventing v1 e2e

[vaikas]

Addresses #3411
Depends on #3360 (this is rebased off of that).

Proposed Changes

• Add e2e tests that exercise broker/trigger v1/v1beta1 matrix

Release Note

Docs

[googlebot]

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[mattmoor]

Produced via:
gofmt -s -w $(find -path './vendor' -prune -o -path './third_party' -prune -o -name '*.pb.go' -prune -o -type f -name '*.go' -print)
goimports -w $(find -name '*.go' | grep -v vendor | grep -v third_party | grep -v .pb.go | grep -v wire_gen.go)

[matzew]

@googlebot I consent.

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CLAs look good, thanks!

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[matzew]

@googlebot all cool

[knative-test-reporter-robot]

The following jobs failed:

Test name	Triggers	Retries
pull-knative-eventing-upgrade-tests		0/3

Failed non-flaky tests preventing automatic retry of pull-knative-eventing-upgrade-tests:

test/upgrade.TestContinuousEventsPropagationWithProber

[chizhg]

/uncc

[matzew]

@googlebot I consent.

[matzew]

@googlebot all cool

[matzew]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [matzew,vaikas]

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[googlebot]

A Googler has manually verified that the CLAs look good.

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[grantr]

@thisisnotapril CLA bot feedback: In this case the CLA bot check was stuck despite the presence of the cla: yes label. When I removed and re-added the label, the check became unstuck.