[release-v1.15] MT-Broker: return retriable status code based on the state to leverage retries

[pierDipi]

This is a cherry-pick of knative#8366

[matzew]

/lgtm
/apporve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[matzew]

/cherry-pick release-v1.16

[openshift-cherrypick-robot]

@matzew: #972 failed to apply on top of branch "release-v1.16":

Applying: MT-Broker: return retriable status code based on the state to leverage retries (#8366)
Using index info to reconstruct a base tree...
M	pkg/broker/filter/filter_handler.go
M	pkg/broker/filter/filter_handler_test.go
M	pkg/broker/ingress/ingress_handler.go
M	pkg/broker/ingress/ingress_handler_test.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/broker/ingress/ingress_handler_test.go
CONFLICT (content): Merge conflict in pkg/broker/ingress/ingress_handler_test.go
Auto-merging pkg/broker/ingress/ingress_handler.go
Auto-merging pkg/broker/filter/filter_handler_test.go
CONFLICT (content): Merge conflict in pkg/broker/filter/filter_handler_test.go
Auto-merging pkg/broker/filter/filter_handler.go
CONFLICT (content): Merge conflict in pkg/broker/filter/filter_handler.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 MT-Broker: return retriable status code based on the state to leverage retries (#8366)

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In response to this:

/cherry-pick release-v1.16

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