Properly initialize branchStatuses

[lionelvillard]

Fixes #6353

Proposed Changes

• 🐛 Fix Parallel not properly updating the status section when the underlying Channel failed to be created

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Fix Parallel not properly reporting underlying Channel creation failures

Docs

[codecov]

Codecov Report

Merging #6354 (b4f6370) into main (3e24a78) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #6354   +/-   ##
=======================================
  Coverage   82.39%   82.39%           
=======================================
  Files         233      233           
  Lines       11565    11567    +2     
=======================================
+ Hits         9529     9531    +2     
  Misses       1573     1573           
  Partials      463      463           

Impacted Files	Coverage Δ
pkg/reconciler/parallel/parallel.go	62.50% <100.00%> (+0.33%)	⬆️

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[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[matzew]

/test upgrade-tests_eventing_main

[lionelvillard]

/cherry-pick release-1.4

[knative-prow-robot]

@lionelvillard: new pull request created: #6362

In response to this:

/cherry-pick release-1.4

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