[Filestream] Always render boolean options with default true

[belimawr]

Proposed commit message

Some options that have true as default were only rendered if set to true preventing uses from setting it to false, which effectively renders the UI toggle useless.

This commit fixes it by always rendering those options, no matter if they're set to true or false.

Assisted-by: gpt-5.6-terra-high

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

Run the tests

cd packages/filestream
elastic-package test policy

Manual test

1. Verify default values in Kibana

Create a Filestream package policy without overriding recursive_glob or clean_removed. In Kibana, use the agent policy's View policy option and locate the generated filestream input.

Expected: the rendered policy contains prospector.scanner.recursive_glob: true and clean_removed: true.

2. Verify disabled values are rendered

Disable the toggle for 'Recursive Glob' and 'Recursive Glob'.

Expected: the rendered policy contains prospector.scanner.recursive_glob: false and clean_removed: false.

## Related issues
## Screenshots

[github-actions]

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[infra-vault-gh-plugin-prod]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[Copilot]

Pull request overview

Updates Filestream policy rendering so boolean options defaulting to true are explicitly rendered and can be set to false.

Changes:

• Adds the clean_removed: true default and bumps the package version.
• Always renders recursive_glob and clean_removed.
• Adds changelog documentation and policy tests for defaults and false overrides.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Summary
packages/filestream/manifest.yml	Adds the clean_removed default and updates the version.
packages/filestream/changelog.yml	Documents the bug fix.
packages/filestream/agent/input/filestream.yml.hbs	Always renders both boolean options.
packages/filestream/_dev/test/policy/test-true-defaults.yml	Tests default values.
packages/filestream/_dev/test/policy/test-true-defaults.expected	Verifies rendered true defaults.
packages/filestream/_dev/test/policy/test-false-overrides.yml	Tests false overrides.
packages/filestream/_dev/test/policy/test-false-overrides.expected	Verifies rendered false values.

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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: 1ffeca2

cc @belimawr

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