[miniflux] Add agentless deployment

[moxarth-rathod]

Proposed commit message

miniflux: add agentless deployment

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

How to test this PR locally

• Clone integrations repo.
• Install the elastic package locally.
• Start the elastic stack using the elastic package.
• Move to integrations/packages/miniflux directory.
• Run the following command to run tests.

elastic-package test -v

Related issues

• Closes [miniflux] Add Agentless Deployment Support #19228

[github-actions]

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[elastic-vault-github-plugin-prod]

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[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 007f744

cc @moxarth-rathod

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Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)