[AWS OTel RDS] Add Drill-down dashboard

[agithomas]

• Enhancement

Proposed commit message

• Add RDS drill-down dashboard
• Add links from the overview dashboard to the drill-down dashboard

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

• Integration testing

How to test this PR locally

• elastic-package build && elastic-package stack up -v -d --services package-registry

Screenshots

Overview dashboard

Detailed dashboard

[github-actions]

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[elastic-vault-github-plugin-prod]

✅ All changelog entries have the correct PR link.

[infra-vault-gh-plugin-prod]

💚 Build Succeeded

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• Commit: 7f5f40d