remove dead functions due to integration

[yinyiqian1]

High Level Overview of Change

Context of Change

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)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.1%. Comparing base (2c94e21) to head (ece6ed1).
⚠️ Report is 11 commits behind head on ripple/confidential-transfer.

Additional details and impacted files

@@                      Coverage Diff                       @@
##           ripple/confidential-transfer   #6683     +/-   ##
==============================================================
- Coverage                          80.2%   80.1%   -0.1%     
==============================================================
  Files                               874     874             
  Lines                             69184   68747    -437     
  Branches                           7562    7548     -14     
==============================================================
- Hits                              55464   55041    -423     
+ Misses                            13720   13706     -14     

Files with missing lines	Coverage Δ
include/xrpl/protocol/ConfidentialTransfer.h	87.5% <ø> (-12.5%)	⬇️
src/libxrpl/protocol/ConfidentialTransfer.cpp	93.8% <ø> (+1.7%)	⬆️

... and 7 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.