[release-1.0] Add Broker Upgrade Tests (#617)

[pierDipi]

Cherry-pick of: #617

[knative-prow-robot]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-1.0@f4a3bf0). Click here to learn what that means.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release-1.0    #1552   +/-   ##
==============================================
  Coverage               ?   76.39%           
  Complexity             ?      582           
==============================================
  Files                  ?       99           
  Lines                  ?     3575           
  Branches               ?      160           
==============================================
  Hits                   ?     2731           
  Misses                 ?      635           
  Partials               ?      209           

Flag	Coverage Δ
java-unittests	82.02% <0.00%> (?)

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[pierDipi]

Nov 29 15:33:02.375 install_latest_release [OUT] error: unable to read URL "https://github.com/knative-sandbox/eventing-kafka-broker/releases/download/v0.27.2/eventing-kafka-controller.yaml", server reported 404 Not Found, status code=404

[pierDipi]

/assign @mgencur @cardil

[mgencur]

/lgtm

[pierDipi]

/cherry-pick release-0.26

[knative-prow-robot]

@pierDipi: #1552 failed to apply on top of branch "release-0.26":

Applying: Add Broker Upgrade Tests (#617)
.git/rebase-apply/patch:2470: trailing whitespace.
[A]                                                                                                                           
.git/rebase-apply/patch:2595: trailing whitespace.
// 
.git/rebase-apply/patch:2598: trailing whitespace.
// 
.git/rebase-apply/patch:2602: trailing whitespace.
// 
.git/rebase-apply/patch:2603: trailing whitespace.
// 
warning: squelched 5 whitespace errors
warning: 10 lines add whitespace errors.
Using index info to reconstruct a base tree...
M	go.sum
M	hack/tools.go
M	test/e2e-common.sh
M	vendor/modules.txt
Falling back to patching base and 3-way merge...
Auto-merging vendor/modules.txt
CONFLICT (content): Merge conflict in vendor/modules.txt
CONFLICT (add/add): Merge conflict in test/e2e-upgrade-tests.sh
Auto-merging test/e2e-upgrade-tests.sh
Auto-merging test/e2e-common.sh
Auto-merging hack/tools.go
Auto-merging go.sum
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Add Broker Upgrade Tests (#617)
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-0.26

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