VReplication: Handle --vreplication_experimental_flags options properly for partial images

[mattlord]

Description

This is a quick follow-up to #17345

In backporting this in a fork, where the --vreplication_experimental_flags were being handled differently — 1) the noblob support was disabled in all unit tests except the noblob ones 2) vplayer batching was not enabled — I noticed some incorrect behavior.

Those fixes and adjustments are made here.

Related Issue(s)

• Follow-up to: VReplication: Support binlog_row_value_options=PARTIAL_JSON #17345

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]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.66%. Comparing base (059d01a) to head (df3171e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17428      +/-   ##
==========================================
- Coverage   67.68%   67.66%   -0.02%     
==========================================
  Files        1583     1583              
  Lines      254321   254319       -2     
==========================================
- Hits       172131   172079      -52     
- Misses      82190    82240      +50     

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