Remove client-side default alpha value

[tsmith023]

Closes #1227

[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 63.49206% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.79%. Comparing base (ccf4f61) to head (fadcebb).
⚠️ Report is 61 commits behind head on main.

Files with missing lines	Patch %	Lines
integration/conftest.py	70.21%	14 Missing ⚠️
weaviate/collections/batch/async_.py	33.33%	4 Missing ⚠️
weaviate/collections/batch/sync.py	33.33%	4 Missing ⚠️
weaviate/backup/executor.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1988      +/-   ##
==========================================
- Coverage   87.84%   87.79%   -0.05%     
==========================================
  Files         280      280              
  Lines       21347    21551     +204     
==========================================
+ Hits        18752    18921     +169     
- Misses       2595     2630      +35     

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