fix integrations with failing parsing hbs templates

[teresaromero]

Proposed commit message

While implementing static validation of the .hbs files used as input and stream templates, some where having issues. This PR fixes the templates where the syntax was not parsing correctly

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

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How to test this PR locally

Related issues

Related elastic/package-spec#1030

[elasticmachine]

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