Remove backup label from MSA since it's backed up by default

[fxiang1]

• I have taken backward compatibility into consideration.

• Remove backup label from MSA since it's backed up by default

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fxiang1

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.79%. Comparing base (e85fafa) to head (90c523f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #430      +/-   ##
==========================================
+ Coverage   55.51%   55.79%   +0.28%     
==========================================
  Files          96       96              
  Lines       15745    15742       -3     
==========================================
+ Hits         8741     8784      +43     
+ Misses       6121     6078      -43     
+ Partials      883      880       -3     

Flag	Coverage Δ
unit	55.79% <ø> (+0.28%)	⬆️

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[fxiang1]

/cc @xiangjingli

[xiangjingli]

/lgtm