VReplication: Improve table plan builder errors

[mattlord]

Description

This is a quick bit of internal cleanup that improves the table plan builder's error messages so that they contain the table name. This is pretty important when a workflow is operating on thousands of tables.

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

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (main@f2d5d1c). Learn more about missing BASE report.

Files	Patch %	Lines
...t/tabletmanager/vreplication/table_plan_builder.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16588   +/-   ##
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  Coverage        ?   68.79%           
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  Files           ?     1557           
  Lines           ?   199891           
  Branches        ?        0           
=======================================
  Hits            ?   137521           
  Misses          ?    62370           
  Partials        ?        0           

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