Add DeployTargets when building a deployment

[Warashi]

What this PR does:

as title

Why we need it:

We use the DeployTargets field in the Deployment model when executing the deployment.

Which issue(s) this PR fixes:

Part of #4980

Does this PR introduce a user-facing change?: No

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

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 26.24%. Comparing base (8ce5252) to head (f0d50fd).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/piped/trigger/deployment.go	0.00%	1 Missing ⚠️
pkg/app/pipedv1/trigger/deployment.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5496   +/-   ##
=======================================
  Coverage   26.23%   26.24%           
=======================================
  Files         460      460           
  Lines       49370    49372    +2     
=======================================
+ Hits        12952    12956    +4     
+ Misses      35389    35388    -1     
+ Partials     1029     1028    -1     

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[ffjlabo]

LGTM