Pipedv1 reports plugins while report metadata

[khanhtc1202]

What this PR does:

as title

Why we need it:

Piped need to report plugins as it metadata, so we can use this info on Web UI application form

Which issue(s) this PR fixes:

Part of #5252
Follow #5545

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 13 lines in your changes missing coverage. Please review.

Project coverage is 26.44%. Comparing base (1e2231f) to head (d13f0a0).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/pipedv1/cmd/piped/piped.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5552      +/-   ##
==========================================
- Coverage   26.44%   26.44%   -0.01%     
==========================================
  Files         465      465              
  Lines       49862    49872      +10     
==========================================
  Hits        13188    13188              
- Misses      35620    35630      +10     
  Partials     1054     1054              

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[ffjlabo]

LGTM