Update FindRollbackStage logic to use pipeline stage rollback value

[khanhtc1202]

What this PR does:

We added rollback to pipelineStage model recently, so I updated the FindRollbackStage logic to depend on that field too

Why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 25.31%. Comparing base (7676161) to head (242b995).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/pipedv1/controller/scheduler.go	0.00%	13 Missing ⚠️
pkg/app/pipedv1/controller/controller.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5313      +/-   ##
==========================================
+ Coverage   25.27%   25.31%   +0.03%     
==========================================
  Files         444      444              
  Lines       47503    47476      -27     
==========================================
+ Hits        12006    12017      +11     
+ Misses      34555    34517      -38     
  Partials      942      942              

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