refactor(sidekiq): drop redundant span clearing

Co-Authored-By: Codex <noreply@example.com>

Author: solnic

sentry-ruby/lib/sentry/scope.rb

@@ -218,10 +218,6 @@ def set_span(span)
       @span = span
     end
 
-    def clear_span
-      @span = nil
-    end
-
     # @!macro set_user
     def set_user(user_hash)
       check_argument_type!(user_hash, Hash)

sentry-sidekiq/lib/sentry/sidekiq/sentry_context_middleware.rb

@@ -53,7 +53,6 @@ def perform_through_active_job(job, sidekiq_job)
         Sentry.clone_hub_to_current_thread
 
         Sentry.with_scope do |scope|
-          scope.clear_span
           consumer.apply_scope_data(scope, sidekiq_job, default_scope_data: job_extension.scope_data(job: sidekiq_job))
           scope.set_transaction_name(job_extension.transaction_name(job: job), source: :task)
           trace_headers = args.first.is_a?(Hash) && args.first.dig("_sentry", "trace_propagation_headers")