Simplify box_events onboarding

[MichelLosier]

Description

Closes: https://github.com/elastic/ingest-dev/issues/8152

Updates box_events integration with a few changes to simplify the experience:

• Sets agentless as the default deployment type
• Groups authentication settings under a shared heading
• Moves non-compulsory fields to show_user: false (Advanced section)
  • Including the httpjson settings which already have opinionated defaults
• Adds tags to pipeline processors as required by adoption of the later package spec

Note although the original issue called for a "Connection Settings" section, this would be unused since the Connection related (url) field fall into the advanced section.

Proposed commit message

box events:

Sets agentless as the default deployment type and simplifies ordering and organization of variables.
Adds tags to pipeline processors as required by the new package-spec version

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

Screenshots

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✅ All changelog entries have the correct PR link.

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💚 Build Succeeded

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• Commit: 6c78572

History

• 💚 Build #44698 succeeded 4151c32

cc @MichelLosier

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