Propagate scope for referenced search filters during content pack installation

[ryan-carroll-graylog]

Description

Use the scope from the top level Search Filter objects for the inline copies during content pack installation.

This keeps parity between the top level search filter objects and the inline entity copies, specifically when the scope is not included at time of export (Illuminate bundles).

For existing mismatched filters a migration has been added in https://github.com/Graylog2/graylog-plugin-enterprise/pull/14647

Motivation and Context

This was causing illuminate installed entities that reference search filters to have the inline copies of ILLUMINATE scoped search filters shown as DEFAULT. E.g. an ILLUMINATE delivered/scoped event definition with filter would be installed with ED and filter correctly ILLUMINATE scoped, but inline filter copy on the ED was DEFAULT.

This interfered with Event definition filter scope immutability checks.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have requested a documentation update.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.