fix: prevent StreamedLog stop() from dropping tail or hanging on silent stream

[vdusek]

Summary

Two related bugs in StreamedLog / StreamedLogAsync (src/apify_client/_streamed_log.py):

• Async — buffered tail was dropped on stop(). Shutdown is driven by stop() cancelling the streaming task. CancelledError unwinds out of async for before the trailing _log_buffer_content(include_last_part=True) runs, so whatever sits in the buffer (the tail after the last 8601 marker) is silently discarded. Wrapping the loop in try/finally guarantees the tail is flushed even on cancel.

• Sync — stop() could hang on a silent stream. iter_bytes() blocks on the socket read, so the _stop_logging flag is never observed until the next chunk arrives or the long-polling timeout (360s) elapses. Passing a 30s read timeout to _log_client.stream() caps how long iter_bytes() can block, so stop() unblocks within that window. The timeout is exposed as StreamedLog._read_timeout so it can be tuned (or shortened in tests) without monkeypatching a module global.

Tradeoff: the sync stream now ends if the actor goes silent for more than 30s (vs. the prior 360s). This is documented on the class attribute and is the intended cost of bounded stop().

Two regression tests cover both bugs.

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.32%. Comparing base (9ab096a) to head (5b6a9dd).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/apify_client/_streamed_log.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
+ Coverage   95.22%   95.32%   +0.09%     
==========================================
  Files          45       45              
  Lines        5154     5156       +2     
==========================================
+ Hits         4908     4915       +7     
+ Misses        246      241       -5     

Flag	Coverage Δ
integration	95.32% <92.85%> (+0.09%)	⬆️

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