enhancement(spd): get spd by workload's name

[cheney-lin]

What type of PR is this?

Enhancements

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (b30e850) 53.38% compared to head (cbd3bf0) 53.49%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
pkg/util/spd.go	60.00%	1 Missing and 1 partial ⚠️
pkg/controller/spd/spd.go	95.23%	0 Missing and 1 partial ⚠️
pkg/webhook/mutating/pod/spd_ref_mutator.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #369      +/-   ##
==========================================
+ Coverage   53.38%   53.49%   +0.10%     
==========================================
  Files         437      437              
  Lines       48140    48155      +15     
==========================================
+ Hits        25699    25759      +60     
+ Misses      19535    19485      -50     
- Partials     2906     2911       +5     

Flag	Coverage Δ
unittest	53.49% <86.20%> (+0.10%)	⬆️

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