VReplication: Fix workflow filtering in GetWorkflows RPC

[mattlord]

Description

This is a follow-up to the work done in #14424 where we moved reads against the vreplication table away from client side generated SQL to typed client-server RPCs (the server then builds the appropriate SELECT against the underlying table).

As part of that work, I errantly always included a workflow include filter in the new RPC request. The result of that is when you want to get/list all workflows, rather than just one, you get no results as the include workflow name filter is '' — meaning only include workflows where the name is empty.

This PR corrects that and adds tests for vtctldclient based "workflow list" related commands.

Related Issue(s)

• Fixes: Bug Report: GetWorkflows RPC does not return any workflows #15498

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.72%. Comparing base (d20f3c5) to head (d92bbdf).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15524      +/-   ##
==========================================
+ Coverage   65.71%   65.72%   +0.01%     
==========================================
  Files        1560     1560              
  Lines      194484   194485       +1     
==========================================
+ Hits       127798   127824      +26     
+ Misses      66686    66661      -25     

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