Add Generic HNSW_DISK_JOB type

[GuyAv46]

Mark if applicable

• This PR introduces API changes
• This PR introduces serialization changes

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Note

Low Risk
Single enum extension with no logic changes; risk is limited to downstream code needing to handle the new job type/value ordering.

Overview
Adds a new JobType enum value, HNSW_DISK_JOB, to represent disk-based HNSW work in the async job system.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.09%. Comparing base (d5f91a8) to head (86fb135).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #911   +/-   ##
=======================================
  Coverage   97.09%   97.09%           
=======================================
  Files         129      129           
  Lines        7500     7500           
=======================================
  Hits         7282     7282           
  Misses        218      218           

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