Add events tracking to to-dos snoozing feature

What does this MR do and why?

Add events tracking to to-dos snoozing feature

Defines some events to be tracked when interacting with the to-dos snoozing feature.

Tracked events

Action	Event action	Event label
User clicks on the For one hour snooze option	click_todo_item_action	snooze_for_one_hour
User clicks on the Until later today snooze option	click_todo_item_action	snooze_until_later_today
User clicks on the Until tomorrow snooze option	click_todo_item_action	snooze_until_tomorrow
User clicks on the Remove snooze button	click_todo_item_action	remove_snooze

References

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MR acceptance checklist

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How to set up and validate locally

1. Setup Snowplow debugging locally: https://docs.gitlab.com/ee/development/internal_analytics/internal_event_instrumentation/local_setup_and_debugging.html.
2. Perform the aforementioned actions.

Related to #17712