Refactor wait plugin: rename package and file

[t-kikuc]

What this PR does:

• Rename execute package to deployment
• Rename server.go to plugin.go

Why we need it:

For name consistency.

Which issue(s) this PR 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

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 26.12%. Comparing base (77664e1) to head (b57e6b8).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/pipedv1/plugin/wait/plugin.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5462      +/-   ##
==========================================
- Coverage   26.14%   26.12%   -0.03%     
==========================================
  Files         457      457              
  Lines       49107    49107              
==========================================
- Hits        12841    12831      -10     
- Misses      35244    35253       +9     
- Partials     1022     1023       +1     

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[khanhtc1202]

👍