[Observability Onboarding] Add AWS Firehose quickstart

[alaudazzi]

Description

This PR adds a new quickstart for AWS Firehose.

Documentation sets edited in this PR

Check all that apply.

• Stateful (docs/en/observability/*)
• Serverless (docs/en/serverless/*)
• Integrations Developer Guide (docs/en/integrations/*)
• None of the above

Related issue

Closes elastic/kibana#191835

Checklist

• Product/Engineering Review
• Writer Review

Follow-up tasks

Select one.

• This PR does not need to be ported to another doc set because:
  • The concepts in this PR only apply to one doc set (serverless or stateful)
  • The PR contains edits to both doc sets (serverless and stateful)
• This PR needs to be ported to another doc set:
  • Port to stateful docs: <link to PR or tracking issue>
  • Port to serverless docs: [Request]: Port #4433 to serverless docs #4434

[github-actions]

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[mykolaharmash]

Looks great! I added just a few minor comments.

[bmorelli25]

run docs-build

[bmorelli25]

Thanks, @alaudazzi! LGTM pending these last two changes from Mykola.

[alaudazzi]

@mykolaharmash
I integrated your feedback. Can you have a final look?

[mykolaharmash]

Thank you @alaudazzi! To me this looks great ✨

[alaudazzi]

@mykolaharmash @kaiyan-sheng
I added the list of (required and optional) parameters.
Here is a doc preview. Can you check if this looks good to you?

[alaudazzi]

From a Slack thread with @mykolaharmash:
"there are two more requests from Akhilesh:

• To add another point to the Limitations section saying that cloudformation template detects and ingests logs/metrics only in a single AWS region
• To add a table that shows whether logs and/or metrics are ingested for every supported AWS service based on this table. It's not about listing the available dashboards but only calling out which data type is supported ("Data Type" column in the spreadsheet) "

[alaudazzi]

@akhileshpok @mykolaharmash
Here is the doc preview with the latest updates. Please let me know if this is OK with you.

[akhileshpok]

@alaudazzi - Thanks. It looks good to me! cc-@mykolaharmash

[akhileshpok]

The doc looks good to me.