Fix Sidekiq JSON logging

What does this MR do and why?

The 'Listening on queues' message was logged before we set the log format (if enabled) to JSON, so it would never be in JSON. We can just move it to later to ensure that it uses the correct format.

For #355568 (closed).

How to set up and validate locally

Before this change:

$ bin/sidekiq-cluster --queue-selector 'feature_category=source_code_management' | head -n 2
{"severity":"INFO","time":"2022-03-14T14:11:09.136Z","message":"Starting cluster with 1 processes"}
2022-03-14T14:11:17.197Z pid=297563 tid=6p7b INFO: Listening on queues ["approval_rules_external_approval_rule_payload", "authorized_keys", "create_commit_signature", "cronjob:admin_email", "cronjob:authorized_project_update_periodic_recalculate", "cronjob:namespaces_prune_aggregation_schedules", "cronjob:repository_archive_cache", "cronjob:repository_check_dispatch", "cronjob:requests_profiles", "cronjob:trending_projects", "cronjob:update_all_mirrors", "cronjob:x509_issuer_crl_check", "delete_merged_branches", "detect_repository_languages", "emails_on_push", "gitlab_shell", "groups_update_statistics", "hashed_storage:hashed_storage_migrator", "hashed_storage:hashed_storage_project_migrate", "hashed_storage:hashed_storage_project_rollback", "hashed_storage:hashed_storage_rollbacker", "invalid_gpg_signature_update", "merge", "merge_request_reset_approvals", "merge_requests_delete_source_branch", "merge_requests_sync_code_owner_approval_rules", "namespaces_update_root_statistics", "post_receive", "process_commit", "project_cache", "project_daily_statistics", "project_destroy", "project_import_schedule", "projects_post_creation", "rebase", "remote_mirror_notification", "repository_check:repository_check_batch", "repository_check:repository_check_clear", "repository_check:repository_check_single_repository", "repository_cleanup", "repository_fork", "repository_remove_remote", "repository_update_mirror", "repository_update_remote_mirror", "system_hook_push", "update_namespace_statistics:namespaces_root_statistics", "update_namespace_statistics:namespaces_schedule_aggregation", "update_project_statistics", "x509_certificate_revoke"]

After this change:

$ bin/sidekiq-cluster --queue-selector 'feature_category=source_code_management' | head -n 2
{"severity":"INFO","time":"2022-03-14T14:15:21.077Z","message":"Starting cluster with 1 processes"}
{"severity":"INFO","time":"2022-03-14T14:15:31.573Z","message":"Listening on queues [\"approval_rules_external_approval_rule_payload\", \"authorized_keys\", \"create_commit_signature\", \"cronjob:admin_email\", \"cronjob:authorized_project_update_periodic_recalculate\", \"cronjob:namespaces_prune_aggregation_schedules\", \"cronjob:repository_archive_cache\", \"cronjob:repository_check_dispatch\", \"cronjob:requests_profiles\", \"cronjob:trending_projects\", \"cronjob:update_all_mirrors\", \"cronjob:x509_issuer_crl_check\", \"delete_merged_branches\", \"detect_repository_languages\", \"emails_on_push\", \"gitlab_shell\", \"groups_update_statistics\", \"hashed_storage:hashed_storage_migrator\", \"hashed_storage:hashed_storage_project_migrate\", \"hashed_storage:hashed_storage_project_rollback\", \"hashed_storage:hashed_storage_rollbacker\", \"invalid_gpg_signature_update\", \"merge\", \"merge_request_reset_approvals\", \"merge_requests_delete_source_branch\", \"merge_requests_sync_code_owner_approval_rules\", \"namespaces_update_root_statistics\", \"post_receive\", \"process_commit\", \"project_cache\", \"project_daily_statistics\", \"project_destroy\", \"project_import_schedule\", \"projects_post_creation\", \"rebase\", \"remote_mirror_notification\", \"repository_check:repository_check_batch\", \"repository_check:repository_check_clear\", \"repository_check:repository_check_single_repository\", \"repository_cleanup\", \"repository_fork\", \"repository_remove_remote\", \"repository_update_mirror\", \"repository_update_remote_mirror\", \"system_hook_push\", \"update_namespace_statistics:namespaces_root_statistics\", \"update_namespace_statistics:namespaces_schedule_aggregation\", \"update_project_statistics\", \"x509_certificate_revoke\"]"}

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