Remove decryption grpc from pipedv1 plugin api

[khanhtc1202]

What this PR does:

as title

Why we need it:

We agreed that Piped should be in charge of preparing the deploy source, and the plugin can just pull and use it. The plugins should not need to care whether the manifest is encrypted or not.

Which issue(s) this PR fixes:

Fixes #

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):

[Warashi]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.80%. Comparing base (6b63206) to head (3ef7e36).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5414      +/-   ##
==========================================
- Coverage   25.82%   25.80%   -0.03%     
==========================================
  Files         450      449       -1     
  Lines       48520    48472      -48     
==========================================
- Hits        12530    12507      -23     
+ Misses      35013    34987      -26     
- Partials      977      978       +1     

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[ffjlabo]

🚀