fix(appointments): unify IDs

[ChristophWurst]

Mixing two IDs makes reading logs more complex than necessary. Let's be consistent.

[ChristophWurst]

/backport to stable6.0

[ChristophWurst]

/backport to stable5.5

[ChristophWurst]

/backport to stable4.7

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.33%. Comparing base (a3846f9) to head (47084f0).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/services/appointmentService.js	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7537      +/-   ##
==========================================
- Coverage   13.34%   13.33%   -0.02%     
==========================================
  Files         218      218              
  Lines       11350    11360      +10     
  Branches     2725     2714      -11     
==========================================
  Hits         1515     1515              
- Misses       9475     9485      +10     
  Partials      360      360              

Flag	Coverage Δ
javascript	13.33% <0.00%> (-0.02%)	⬇️

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[ChristophWurst]

CI fix at #7532

[ChristophWurst]

Tests are not passing