Add pytest timeouts

[tsmith023]

• mark batch tests specifically with long timeouts
• add timeouts to GH action jobs as a backup
• dump full stack-trace on timeout detection to debug hangs in the CI

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[codecov-commenter]

Codecov Report

❌ Patch coverage is 78.81356% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.91%. Comparing base (78fa5f7) to head (a674ec1).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
conftest.py	68.75%	10 Missing ⚠️
weaviate/collections/batch/async_.py	60.86%	9 Missing ⚠️
weaviate/collections/batch/sync.py	76.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2015      +/-   ##
==========================================
- Coverage   87.95%   87.91%   -0.04%     
==========================================
  Files         280      282       +2     
  Lines       21664    21755      +91     
==========================================
+ Hits        19054    19126      +72     
- Misses       2610     2629      +19     

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