[DOCS] Adds the 8.0.0-rc1 release notes

[KOTungseth]

Summary

Adds the release notes for 8.0.0-rc1.

[elasticmachine]

Pinging @elastic/kibana-docs (Team:Docs)

[lukeelmers]

I'm not sure if this should be "saved objects types" or "saved object types". The latter sounds more correct to me, but I don't know what the rules are 🙂

[lukeelmers]

Also, instead of that PR, I think we should instead link to this issue, which contains much more context on the change: #107678

The PR has very little info; most of the discussion that would be relevant to users is in the issue.

[jportner]

I have one suggested addition below!

[dedemorton]

This description doesn't really capture everything that has changed (as described in the impact section). Plus I don't see any detail about /api/fleet/agents in under "impact." It feels like the "Details" section is too specific and the "Impact" section is incomplete.

Maybe someone on the dev team should clarify based on what we want to highlight for users. I don't think I'm the person to make this call.

[KOTungseth]

@dedemorton can you add someone from the Dev team to review?

[dedemorton]

I think @juliaElastic is probably the best person to comment since they opened #119494.

[juliaElastic]

@dedemorton hi, is the CHANGELOG generated from somewhere or are you expecting me to suggest how to update it?

[dedemorton]

@juliaElastic I think these entries begin in the changelog, but get edited and formatted by the Kibana writers. You should suggest changes if you think (as I do) that this section needs more work.

[KOTungseth]

@dedemorton @juliaElastic I need to merge these release notes in preparation for the release tomorrow. Please feel free to open a separate PR for any changes you want to make, and let me know if you need any help.

[juliaElastic]

@dedemorton
So to summarize:
Changes in Fleet API for consistency, previous versions are still working, and deprecated.

1. Rename hyphens to undescores:

• /api/fleet/enrollment-api-keys
• /api/fleet/agent-status
• /api/fleet/service-tokens

2. Change packages endpoint to split pkgkey path parameter:

• /epm/packages/{pkgkey} to /epm/packages/{packageName}/{version}

3. Rename response or list to items in response properties:

• /api/fleet/enrollment_api_keys
• /api/fleet/agents
• /epm/packages/
• /epm/categories
• /epm/packages/_bulk
• /epm/packages/limited
• POST and DELETE /epm/packages/{packageName}/{version}

4. Rename response to item in response properties:

• GET and PUT /epm/packages/{packageName}/{version}

[kibana-ci]

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cc @KOTungseth

[KOTungseth]

💚 All backports created successfully

Status	Branch	Result
✅	8.0

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