v20 backport: Throttler/vreplication: fix app name used by VPlayer (#16578)

[shlomi-noach]

Manual backport of #16578 to 20.0

Description

VPlayer was incorrectly identifying itself to the throttler as vcopier. As result, running ApplyThrottlerConfig --throttle-app=vplayer made no effect on VPlayer. This PR fixes the problem.

Related Issue(s)

Context: #16575 (this PR does not fix this issue, just related)

Backports

This is a bug. Backporting to 20, 19, 18 where this issue is relevant.

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.68%. Comparing base (3e8ce7e) to head (815b5fe).

Additional details and impacted files

@@              Coverage Diff              @@
##           release-20.0   #16579   +/-   ##
=============================================
  Coverage         68.67%   68.68%           
=============================================
  Files              1541     1541           
  Lines            197870   197870           
=============================================
+ Hits             135888   135900   +12     
+ Misses            61982    61970   -12     

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