Merge branch 'sh-fix-sidekiq-exporter-log-format' into 'master'

Make Sidekiq exporter logs conform to Sidekiq logs

Closes #215381

See merge request gitlab-org/gitlab!30268

lib/gitlab/metrics/exporter/sidekiq_exporter.rb

@@ -32,7 +32,7 @@ module Gitlab
           Sidekiq.logger.error(
             class: self.class.to_s,
             message: 'Cannot start sidekiq_exporter',
-            exception: e.message
+            'exception.message' => e.message
           )
 
           false

spec/lib/gitlab/metrics/exporter/sidekiq_exporter_spec.rb

@@ -53,7 +53,7 @@ describe Gitlab::Metrics::Exporter::SidekiqExporter do
         .with(
           class: described_class.to_s,
           message: 'Cannot start sidekiq_exporter',
-          exception: anything)
+          'exception.message' => anything)
 
       exporter.start
     end