[Elastic Agent] Remove ccs index patterns from elastic agent rule templates

[MichelLosier]

Proposed commit message

Removes ccs index patterns from rule templates for broader compatibility.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes: [Elastic agent] Queries targeting remote clusters #16638

Screenshots

[elastic-vault-github-plugin-prod]

🚀 Benchmarks report

Package elastic_agent 👍(1) 💚(0) 💔(1)

Expand to view

Data stream	Previous EPS	New EPS	Diff (%)	Result
status_change_logs	333333.33	250000	-83333.33 (-25%)	💔

To see the full report comment with /test benchmark fullreport

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 21a404a

cc @MichelLosier

[nchaulet]

🚀

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[elastic-vault-github-plugin-prod]

Package elastic_agent - 2.6.11 containing this change is available at https://epr.elastic.co/package/elastic_agent/2.6.11/