chore: separate atkey upload to a service in at_onboarding_flutter #405

Job	Run time
static_analysis (at_backupkey_flutter, stable)	1m 18s
static_analysis (at_backupkey_flutter, beta)	1m 11s
static_analysis (at_chat_flutter, stable)	1m 23s
static_analysis (at_chat_flutter, beta)	1m 19s
static_analysis (at_common_flutter, stable)	53s
static_analysis (at_common_flutter, beta)	52s
static_analysis (at_contacts_flutter, stable)	1m 12s
static_analysis (at_contacts_flutter, beta)	1m 10s
static_analysis (at_contacts_group_flutter, stable)	1m 16s
static_analysis (at_contacts_group_flutter, beta)	1m 16s
static_analysis (at_events_flutter, stable)	1m 31s
static_analysis (at_events_flutter, beta)	1m 16s
static_analysis (at_follows_flutter, stable)	1m 22s
static_analysis (at_follows_flutter, beta)	1m 15s
static_analysis (at_invitation_flutter, stable)	1m 15s
static_analysis (at_invitation_flutter, beta)	1m 17s
static_analysis (at_location_flutter, stable)	1m 30s
static_analysis (at_location_flutter, beta)	1m 16s
static_analysis (at_login_flutter, stable)	1m 16s
static_analysis (at_login_flutter, beta)	1m 11s
static_analysis (at_notify_flutter, stable)	1m 22s
static_analysis (at_notify_flutter, beta)	1m 9s
static_analysis (at_onboarding_flutter, stable)	1m 21s
static_analysis (at_onboarding_flutter, beta)	1m 15s
static_analysis (at_sync_ui_flutter, stable)	1m 13s
static_analysis (at_sync_ui_flutter, beta)	1m 9s
static_analysis (at_theme_flutter, stable)	1m 14s
static_analysis (at_theme_flutter, beta)	1m 12s
	34m 54s

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