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feat: Add PROJECT_ARCHIVED event to send message to Slack (#8848)

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## About the changes
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### Summary

- Add `PROJECT_ARCHIVED` event on `EVENT_MAP` to use
- Add a test case for `PROJECT_ARCHIVED` event formatting 
- Add `PROJECT_ARCHIVED` event when users choose which events they send
to Slack
- Fix Slack integration document by adding `PROJECT_ARCHIVED`

### Example

The example message looks like the image below. I covered my email with
a black rectangle to protect my privacy 😄
The link refers `/projects-archive` to see archived projects.

<img width="529" alt="Slack message example"
src="https://github.com/user-attachments/assets/938c639f-f04a-49af-9b4a-4632cdea9ca7">

## Discussion points
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Got any questions or doubts? -->

I considered the reason why Unleash didn't implement to send
`PROJECT_ARCHIVED` message to Slack integration.

One thing I assumed that it is impossible to create a new project with
open source codes, which means it is only enabled in the enterprise
plan. However,
[document](https://docs.getunleash.io/reference/integrations/slack-app#events)
explains that users can send `PROJECT_CREATED` and `PROJECT_DELETED`
events to Slack, which are also available only in the enterprise plan,
hence it means we need to embrace all worthwhile events.

I think it is reasonable to add `PROJECT_ARCHIVED` event to Slack
integration because users, especially operators, need to track them
through Sla... (continued)

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