fix: Do not mask unrelated import errors when guarding optional dependencies

[vdusek]

try_import now swallows only the ModuleNotFoundError of the optional dependency it names, so an import error raised by the importing module itself or by another dependency propagates instead of being masked. __all__ of apify_client.http_compressors omits BrotliHttpCompressor when the brotli extra is not installed, since the symbol was never provided.

Split out of #1006.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.89%. Comparing base (31f7854) to head (e38c0b5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1009      +/-   ##
==========================================
+ Coverage   94.86%   94.89%   +0.02%     
==========================================
  Files          58       58              
  Lines        5357     5366       +9     
==========================================
+ Hits         5082     5092      +10     
+ Misses        275      274       -1     

Flag	Coverage Δ
integration	92.30% <60.00%> (+0.16%)	⬆️
unit	84.66% <100.00%> (+0.02%)	⬆️

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