Move model.DeploymentSource to deployment.DeploymentSource

[Warashi]

What this PR does:

as title.

Why we need it:

I don't want plugins to depend directly on pkg/model.

Both pipedv1 and plugins depend on DeploymentSource, so I moved it.

Dependencies remain in Go codes because proto files under pkg/plugin depend on pkg/model, and the plugin has to build its structs to return them as the gRPC responses.

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 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 24.36%. Comparing base (2c02136) to head (8f73a7c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/pipedv1/controller/planner.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5290      +/-   ##
==========================================
- Coverage   24.37%   24.36%   -0.02%     
==========================================
  Files         442      442              
  Lines       46902    46902              
==========================================
- Hits        11432    11426       -6     
- Misses      34560    34566       +6     
  Partials      910      910              

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[ffjlabo]

LGTM

[khanhtc1202]

LGTM 👍