Known Issues + Access requirements for Crowdstrike Connector

[joepeeples]

Resolves https://github.com/elastic/security-docs-internal/issues/43, updates both ESS and serverless docs.

🚧 work in progress 🚧
Still need to finish filling in details in known issue item.

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[mergify]

This pull request is now in conflicts. Could you fix it @joepeeples? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b internal-43-crowdstrike-reqs-known-issue upstream/internal-43-crowdstrike-reqs-known-issue
git merge upstream/main
git push upstream internal-43-crowdstrike-reqs-known-issue