fix: block_in_place to allow nested tasks

[ion-elgreco]

Description

• closes Runtime panic in new streaming writer: Cannot start a runtime from within a runtime #3271

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 72.17%. Comparing base (6437e7a) to head (da8311a).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
python/src/filesystem.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3324      +/-   ##
==========================================
- Coverage   72.20%   72.17%   -0.03%     
==========================================
  Files         145      145              
  Lines       45890    45891       +1     
  Branches    45890    45891       +1     
==========================================
- Hits        33135    33122      -13     
- Misses      10667    10668       +1     
- Partials     2088     2101      +13     

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