Add deleting custom grade types.

SharezoneApp / sharezone-app

Sharezone is a collaborative school organization app for iOS, Android, macOS and web with +500,000 downloads. Built with Flutter & Firebase.

European Union Public License 1.2

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Add GradeService.deleteCustomGradeType:

  /// Deletes a custom grade type and removes it from all weight maps.
  ///
  /// A custom grade type can only be deleted if it is not assigned to any grade
  /// or as the final grade type of any term, otherwise a
  /// [GradeTypeStillAssignedException] is thrown.
  ///
  /// Throws [GradeTypeNotFoundException] if the grade type with the given [id]
  /// does not exist.
  ///
  /// Throws [ArgumentError] if the grade type with the given [id] is a
  /// predefined grade type.
  void deleteCustomGradeType(GradeTypeId id) {

Fixes #1532

SharezoneApp / sharezone-app

Add deleting custom grade types. #1597