enhance: unmashall ts msg in dispatcher instead in msgstream

[aoiasd]

relate: #38655

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Additional details and impacted files

@@            Coverage Diff            @@
##             master   #38656   +/-   ##
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  Coverage          ?   69.33%           
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  Files             ?      292           
  Lines             ?    26187           
  Branches          ?        0           
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  Hits              ?    18158           
  Misses            ?     8029           
  Partials          ?        0           

Components	Coverage Δ
Client	∅ <ø> (?)
Core	69.33% <ø> (?)
Go	∅ <ø> (?)

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@aoiasd go-sdk check failed, comment rerun go-sdk can trigger the job again.

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@aoiasd E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.