Rails/RedundantPresenceValidationOnBelongsTo incorrectly fixes cases where validation is conditional

[mheguy-stingray]

Rails/RedundantPresenceValidationOnBelongsTo changes the following:

class DataExport < ApplicationRecord
  belongs_to :survey
  validates :survey, presence: true, unless: -> { condition }
end

to:

class DataExport < ApplicationRecord
  belongs_to :survey
  validates :survey, unless: -> { condition  }
end

Dropping the condition on the presence check clearly has an effect on behaviour.

The doc indicates that the cop is marked unsafe because the error message changes, so this seems like a bug.

Specs:

1.56.2 (using Parser 3.2.2.3, rubocop-ast 1.29.0, running on ruby 3.2.2) [x86_64-linux]
  - rubocop-factory_bot 2.23.1
  - rubocop-rails 2.20.2
  - rubocop-rspec 2.23.2