[0.25] KafkaChannel to init offsets before dispatcher

[aliok]

Manual cherry pick of the same fix in 0.24: #886

Release Note

- 🐛  Fixed a bug that was causing Kafka Channel dispatcher to miss some events in case the offset for the consumer group was not initialized

Docs

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-sandbox-eventing-kafka-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/channel/consolidated/dispatcher/dispatcher.go	64.5%	66.1%	1.6
pkg/channel/consolidated/reconciler/controller/kafkachannel.go	54.8%	54.2%	-0.6
pkg/common/consumer/consumer_factory.go	87.2%	84.8%	-2.4
pkg/common/consumer/consumer_manager.go	96.9%	95.6%	-1.2
pkg/common/consumer/consumergroup_offsets_checker.go	Do not exist	4.0%
pkg/common/kafka/offset/offsets.go	81.1%	81.5%	0.4
pkg/source/adapter/adapter.go	52.1%	55.4%	3.3

[knative-prow-robot]

@aliok: 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
pull-knative-sandbox-eventing-kafka-go-coverage	eddac47	link	false	/test pull-knative-sandbox-eventing-kafka-go-coverage

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-0.25@e0bdb38). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             release-0.25     #913   +/-   ##
===============================================
  Coverage                ?   74.06%           
===============================================
  Files                   ?      139           
  Lines                   ?     6212           
  Branches                ?        0           
===============================================
  Hits                    ?     4601           
  Misses                  ?     1382           
  Partials                ?      229           

---

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[matzew]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[aliok]

/cherrypick release-0.26

I think there are conflicts but gonna try anyway

[knative-prow-robot]

@aliok: #913 failed to apply on top of branch "release-0.26":

Applying: Cherry pick 3f2a9d7
Using index info to reconstruct a base tree...
M	go.mod
M	go.sum
M	pkg/channel/consolidated/reconciler/controller/kafkachannel.go
M	pkg/channel/consolidated/reconciler/controller/kafkachannel_test.go
M	pkg/channel/distributed/dispatcher/controller/kafkachannel.go
M	pkg/channel/distributed/dispatcher/controller/kafkachannel_test.go
M	pkg/common/consumer/consumer_manager_test.go
M	pkg/source/adapter/adapter.go
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
Removing vendor/knative.dev/networking/pkg/prober/prober.go
Removing vendor/knative.dev/networking/pkg/prober/doc.go
Removing vendor/knative.dev/networking/LICENSE
Removing third_party/VENDOR-LICENSE/knative.dev/networking/pkg/prober/LICENSE
Auto-merging pkg/source/adapter/adapter.go
Auto-merging pkg/common/consumer/consumer_manager_test.go
Auto-merging pkg/channel/distributed/dispatcher/controller/kafkachannel_test.go
Auto-merging pkg/channel/distributed/dispatcher/controller/kafkachannel.go
Removing pkg/channel/consolidated/status/status_test.go
Removing pkg/channel/consolidated/status/status.go
Removing pkg/channel/consolidated/reconciler/controller/lister.go
Auto-merging pkg/channel/consolidated/reconciler/controller/kafkachannel_test.go
CONFLICT (content): Merge conflict in pkg/channel/consolidated/reconciler/controller/kafkachannel_test.go
Auto-merging pkg/channel/consolidated/reconciler/controller/kafkachannel.go
Removing pkg/channel/consolidated/dispatcher/subscription_endpoint_test.go
Removing pkg/channel/consolidated/dispatcher/subscription_endpoint.go
Auto-merging go.sum
CONFLICT (content): Merge conflict in go.sum
Auto-merging go.mod
CONFLICT (content): Merge conflict in go.mod
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Cherry pick 3f2a9d7
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:

/cherrypick release-0.26

I think there are conflicts but gonna try anyway

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