Add Active Property to Feature Flag Form

What does this MR do?

Continues the work of #13416 (closed) by allowing the active property to be passed to the feature flag form. If this prop is false, it will disable the toggles for all the scopes.

As this will ultimately be behind the feature flag featureFlagToggle, I've elected to not include a changelog.

Screenshots

Before	After

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• 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