Add plugins to piped model

[khanhtc1202]

What this PR does:

as title

Why we need it:

We need to use plugins' information in the application form on the UI. This PR adds the plugin information to the piped model, and when piped is fetched and shown on the UI, we can have plugin info to use.

Which issue(s) this PR fixes:

Part of #5252

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 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 26.41%. Comparing base (ea25ab8) to head (2e15425).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/datastore/datastoretest/datastore.mock.go	0.00%	4 Missing ⚠️
pkg/datastore/pipedstore.go	0.00%	2 Missing ⚠️
pkg/app/server/grpcapi/piped_api.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5545      +/-   ##
==========================================
- Coverage   26.43%   26.41%   -0.03%     
==========================================
  Files         465      465              
  Lines       49885    49907      +22     
==========================================
- Hits        13188    13181       -7     
- Misses      35643    35671      +28     
- Partials     1054     1055       +1     

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[t-kikuc]

lgtm

[ffjlabo]

LGTM