fix: Remove fatal assertion on Linux thread name truncation

[vlntb]

High Level Overview of Change

Fixes a crash in DEBUG builds when thread names exceed Linux's 15-character limit.

Context of Change

1. Removed fatal assertion in CurrentThreadName.cpp
2. Fixed OrderBook job naming in OrderBookDBImpl.cpp

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[xrplf-ai-reviewer]

No issues.

Review by Claude Opus 4.6 · Prompt: V12

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.4%. Comparing base (29e49ab) to head (34d8fdc).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/xrpld/app/ledger/OrderBookDBImpl.cpp	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6690   +/-   ##
=======================================
  Coverage     81.4%   81.4%           
=======================================
  Files          999     999           
  Lines        74424   74423    -1     
  Branches      7553    7552    -1     
=======================================
+ Hits         60605   60606    +1     
+ Misses       13819   13817    -2     

Files with missing lines	Coverage Δ
src/libxrpl/beast/core/CurrentThreadName.cpp	81.8% <ø> (+6.8%)	⬆️
src/xrpld/app/ledger/OrderBookDBImpl.cpp	78.9% <0.0%> (ø)

... and 1 file with indirect coverage changes

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