Refactor the test cases for sinkbindingselectionmode

[houshengbo]

No description provided.

[knative-prow]

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This pull-request has been approved by: houshengbo

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[codecov]

Codecov Report

❌ Patch coverage is 55.14019% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.94%. Comparing base (923f031) to head (fb4daec).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/reconciler/common/base_reconciler.go	0.00%	28 Missing ⚠️
pkg/reconciler/common/workload_override.go	70.58%	14 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2113      +/-   ##
==========================================
- Coverage   62.16%   61.94%   -0.22%     
==========================================
  Files          49       50       +1     
  Lines        2318     2381      +63     
==========================================
+ Hits         1441     1475      +34     
- Misses        785      815      +30     
+ Partials       92       91       -1     

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[knative-prow-robot]

PR needs rebase.

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[dprotaso]

bump @houshengbo unsure if you still need this