[release-20.0] VReplication Workflow: set state correctly when restarting workflow streams in the copy phase (#16217)

[vitess-bot]

Description

This is a backport of #16217

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

• Bug fixes should have at least one unit or end-to-end test, enhancement and new features should have a sufficient number of tests.

Documentation

• Apply the release notes (needs details) label if users need to know about this change.
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• There should be a comment at the top of each new or modified test to explain what the test does.

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Backward compatibility

• Protobuf changes should be wire-compatible.
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• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-20.0@e5dd319). Learn more about missing BASE report.
Report is 1 commits behind head on release-20.0.

Files	Patch %	Lines
go/vt/vttablet/tabletmanager/rpc_vreplication.go	85.71%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release-20.0   #16224   +/-   ##
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  Coverage                ?   68.55%           
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  Files                   ?     1541           
  Lines                   ?   197757           
  Branches                ?        0           
===============================================
  Hits                    ?   135581           
  Misses                  ?    62176           
  Partials                ?        0           

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