Add tests for confidential delegation with tickets

[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 81.7%. Comparing base (0d7bf69) to head (473b605).
⚠️ Report is 1 commits behind head on ripple/confidential-transfer.

Additional details and impacted files

@@                     Coverage Diff                      @@
##           ripple/confidential-transfer   #6808   +/-   ##
============================================================
  Coverage                          81.7%   81.7%           
============================================================
  Files                              1023    1023           
  Lines                             75714   75714           
  Branches                           7576    7557   -19     
============================================================
+ Hits                              61840   61863   +23     
+ Misses                            13874   13851   -23     

see 7 files with indirect coverage changes

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[PeterChen13579]

LGTM