Create API fuzzing configuration form

What does this MR do?

This creates the basic API fuzzing configuration form. At the moment, the form can not be submitted, this only implements the layout, the GraphQL query to fetch data to populate the fields and the collapse/expand logic for the sections that require it.

The form will be made functional in the follow-up issue: #299127 (closed)

How to test this?

1. Enable the :api_fuzzing_configuration_ui feature flag:

echo "Feature.enable(:api_fuzzing_configuration_ui)" | rails c

2. Browse to the API fuzzing configuration form at /:namespace/:project/-/security/configuration/api_fuzzing

Screenshots (strongly suggested)

State	Preview
Default
All sections expanded (as a maintainer)
Open API scan mode selected
Authentication section expanded (as a developer)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry (behind a feature flag)
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Related to #299126 (closed)