Replace `e.printStackTrace()` with `LogEvent.logError()`

1

PR #2835 — Replace e.printStackTrace() with LogEvent.logError()

Small fix across 7 backend files. Replaced 11 instances of the e.printStackTrace() anti-pattern with the project’s standard LogEvent.logError(e) logging. Improves error visibility and enables proper log aggregation.

Validation:

  • Build passes: mvn clean install -DskipTests
  • Spotless formatting applied
  • No logic changes — direct 1:1 replacement
  • Self-reviewed code
  • No breaking changes

@Agaba_Derrick_Junior @Moses_Mutesasira