Need more examples for on_search in Jobs and Internships

The current [example](https://github.com/beckn/DSEP-Specification/blob/master/artefacts/beckn%20specifications/jobs-internships/search/on_search%20response.json) for `on_search` only explain a simple job catalog.

More example catalogs need to be added where,

1. Catalog for internships, volunteering, gig workers / freelancers
2. Catalog containing jobs with required skills, rating, aging, educational reqs etc. Refer to examples like [this](https://www.naukri.com/job-listings-react-java-full-stack-engineer-mercedes-benz-bangalore-bengaluru-3-to-6-years-200723006493?src=drecomm_dashboard).
3. Employer has a job application form hosted on their own career page that the BAP user is redirectd to after discovery
4. Employer has a job application form that can be natively rendered on the BAP's UI

Refer to as many career portals as possible and create different types of catalogs.

Start with the linked on_search response.json example and compare its catalog structure with the four requested cases: internships or gig work, richer job requirements, external application forms, and natively rendered forms. Research career portals as requested and add distinct catalogs that cover those cases; done means the examples clearly represent each requested scenario.

Written by the indexing model from the issue text.