VReplication: Add custom logger support to Workflow Server

[mattlord]

Description

This is a bit of internal cleanup done as part of transitioning to the new client and its associated packages.

This closes a feature gap between the clients' internal packages by adding a feature of the wrangler package to the workflow package which it was heretofor missing — with the workflow package replacing the wrangler package in the client transition.

Related Issue(s)

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

[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.
• New features should be documented.
• There should be some code comments as to why things are implemented the way they are.
• There should be a comment at the top of each new or modified test to explain what the test does.

New flags

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• Flag names must be clear and intuitive, use dashes (-), and have a clear help text.

If a workflow is added or modified:

• Each item in Jobs should be named in order to mark it as required.
• If the workflow needs to be marked as required, the maintainer team must be notified.

Backward compatibility

• Protobuf changes should be wire-compatible.
• Changes to _vt tables and RPCs need to be backward compatible.
• RPC changes should be compatible with vitess-operator
• If a flag is removed, then it should also be removed from vitess-operator and arewefastyet, if used there.
• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

Attention: Patch coverage is 40.42553% with 56 lines in your changes missing coverage. Please review.

Project coverage is 68.82%. Comparing base (95c77e9) to head (854526d).
Report is 1 commits behind head on main.

Files	Patch %	Lines
go/vt/vtctl/workflow/server.go	48.33%	31 Missing ⚠️
go/vt/vtctl/workflow/traffic_switcher.go	34.78%	15 Missing ⚠️
go/vt/vtctl/workflow/server_options.go	0.00%	9 Missing ⚠️
go/vt/vtctl/workflow/utils.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16547   +/-   ##
=======================================
  Coverage   68.82%   68.82%           
=======================================
  Files        1557     1558    +1     
  Lines      200007   200025   +18     
=======================================
+ Hits       137648   137677   +29     
+ Misses      62359    62348   -11     

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