Add PagesDomains::PagesDomainCreatedEvent event
What does this MR do and why?
Context
As part of &7920 (closed), a new cache mechanism was added to Gitlab Pages internal API. This cache must be invalidated in many different situations, and for that we're using the Gitlab Event Store to dispatch/subscribe to these events.
This MR
This MR introduce the PagesDomains::PagesDomainCreatedEvent
event, which is one of the events required to invalidate the Gitlab Pages internal API cache (introduced in #363867 (closed)).
Another MR will use this event to invalidate the cache, like it was done in !92015 (merged)
Related to: #374027 (closed)
FAQ
- Does it make sense to guard these changes under a FF?
- The main feature, that will consume this event (following MR), is behind a FF (cache_pages_domain_api, introduced in !88956 (merged))
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