[OpenCTI] Automatically Create STIX Indicators from Form Intake Observables

## Use case Form Intakes allow users to ingest observables into the platform. Currently, observables are created as standalone STIX Observable objects. We need to add an option at the section level to automatically create corresponding STIX Indicator objects for each observable entered through the form. ## Current Workaround Manually create the corresponding STIX indicators ## Proposed Solution Add a configuration option (Automatically create STIX Indicator for ingested observables) in Form Intake sections that handle observables. When enabled, the platform creates both the Observable and its corresponding Indicator with a based-on relationships.