Add Browser Isolation Non-identity onramp support

[pierreca]

Description

Add a non_identity_enabled JSON field to the Browser Isolation settings structure in the Zero trust account.

Has your change been tested?

The unit test was updated to reflect the new fields.

Screenshots (if appropriate):

This is the corresponding dashboard setting:

Types of changes

What sort of change does your code introduce/modify?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• 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 updated the documentation accordingly. NOTE: Feature already documented
• I have added tests to cover my changes.
• All new and existing tests passed.
• This change is using publicly documented in cloudflare/api-schemas
  and relies on stable APIs. NOTE: OpenAPI source updated, awaiting roll out.

[github-actions]

changelog detected ✅

[github-actions]

This functionality has been released in v0.80.0.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!