feat: add support for blobHash property type

[antas-marcin]

Summary

• Add DataType.BLOB_HASH ("blobHash") to the DataType enum, mirroring the existing BLOB type
• Add test coverage for the new property type in test_config_create_with_properties

Test plan

• test_config_create_with_properties passes with the new BLOB_HASH data type across all vectorizer parameterizations

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Secrets	0   0   0   0	View in Orca

[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 28.57143% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.85%. Comparing base (ccf4f61) to head (6d58d21).
⚠️ Report is 61 commits behind head on main.

Files with missing lines	Patch %	Lines
weaviate/collections/config/executor.py	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1986      +/-   ##
==========================================
+ Coverage   87.84%   87.85%   +0.01%     
==========================================
  Files         280      280              
  Lines       21347    21515     +168     
==========================================
+ Hits        18752    18903     +151     
- Misses       2595     2612      +17     

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