Add summary section to weight template to fix weights in PR

[imstar15]

In this PR, we only have the weights from the previous version, but not the weights from the current version.
#467

We need to include a summary section in the template to generate the correct text.

It would generate these lines:

// Summary:
//:schedule_xcmp_task_full 130_899_385
//:schedule_auto_compound_delegated_stake_task_full 95_776_000
//:schedule_dynamic_dispatch_task 72_653_946
//:schedule_dynamic_dispatch_task_full 82_034_398
//:cancel_scheduled_task_full 979_075_000
//:force_cancel_scheduled_task 27_445_000
//:force_cancel_scheduled_task_full 982_347_000
//:run_xcmp_task 41_572_000
//:run_auto_compound_delegated_stake_task 63_602_000
//:run_dynamic_dispatch_action 8_164_000
//:run_dynamic_dispatch_action_fail_decode 785_000
//:run_missed_tasks_many_found 311_838
//:run_missed_tasks_many_missing 294_793
//:run_tasks_many_found 3_768_036
//:run_tasks_many_missing 2_862_924
//:update_task_queue_overhead 2_761_000
//:append_to_missed_tasks 3_209_620
//:update_scheduled_task_queue 35_844_000
//:shift_missed_tasks 32_373_000

https://github.com/OAK-Foundation/OAK-blockchain/blob/b4903cb48628b6776f41beb28a880d2c9e130773/pallets/automation-time/src/weights.rs#L48-L67

[chrisli30]

@v9n could you help review this change?

[v9n]

looks good