fix: Properly handle phase transitions in row-wise sinks

[coastalwhite]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 87.87879% with 24 lines in your changes missing coverage. Please review.

Project coverage is 80.59%. Comparing base (aa8e47f) to head (b06cc31).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-stream/src/nodes/io_sinks/mod.rs	81.03%	11 Missing ⚠️
...rs-stream/src/nodes/io_sinks/partition/max_size.rs	87.05%	11 Missing ⚠️
crates/polars-stream/src/nodes/io_sinks/csv.rs	96.96%	1 Missing ⚠️
crates/polars-stream/src/nodes/io_sinks/json.rs	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21600      +/-   ##
==========================================
+ Coverage   80.57%   80.59%   +0.02%     
==========================================
  Files        1604     1604              
  Lines      231633   231526     -107     
  Branches     2650     2650              
==========================================
- Hits       186637   186606      -31     
+ Misses      44379    44303      -76     
  Partials      617      617              

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