[aws_otel] add slos and alerts to readme

[jakubgalecki0]

Proposed commit message

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

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[github-actions]

Elastic Docs Style Checker (Vale)

Summary: 2 suggestions found

💡 Suggestions (2): Optional style improvements. Apply when helpful.

File	Line	Rule	Message
packages/aws_ec2_otel/docs/README.md	43	Elastic.WordChoice	Consider using 'start, run' instead of 'boot', unless the term is in the UI.
packages/aws_lambda_otel/docs/README.md	39	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.

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The Vale linter checks documentation changes against the Elastic Docs style guide. To use Vale locally or report issues, refer to Elastic style guide for Vale.

[elastic-vault-github-plugin-prod]

✅ All changelog entries have the correct PR link.

[elasticmachine]

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