Add documentation for iteration data and execution metadata API

[mintlify]

This PR adds comprehensive documentation for the new rq.info and rq.iterationData APIs that provide access to execution metadata and iteration data in API client scripts. The documentation includes API reference pages, usage examples, and integration with existing script and data file documentation.

Files Changed

• general/api-client/rq-api-reference/rq-info.mdx (new)
• general/api-client/rq-api-reference/rq-iteration-data.mdx (new)
• general/api-client/collection-runner-data-file.mdx (updated)
• general/api-client/scripts.mdx (updated)
• docs.json (updated navigation)

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Created by Mintlify agent

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