SEI-14430 Add Export Productivity and Efficiency Metrics Using the Harness SEI API Documentation

[alai97]

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Description

• Please describe your changes: Adds a doc page on exporting Productivity and Efficiency metrics using the SEI API. Also adds a tile on the SEI landing page to draw attention to the API section of the SEI 2.0 doc set. Conversation with Yash in Jira.
• Jira/GitHub Issue numbers (if any): https://harness.atlassian.net/browse/SEI-14452
• Preview links/images (Internal contributors only): /docs/software-engineering-insights/harness-sei/api/export-insights

PR lifecycle

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PRs must meet these requirements to be merged:

• Successful preview build.
• Code owner review.
• No merge conflicts.
• Release notes/new features docs: Feature/version released to at least one prod environment.

[bot-gitexp-user]

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[bot-gitexp-user]

Please check the Execution Link of the Pipeline for the Website Draft URL. This is located in the Preview Step behind the Harness VPN and also is available in #hdh_alerts. E.g Website Draft URL: https://unique-id--harness-developer.netlify.app. Current Draft URL is: https://68ed61ed6988f8b42555bafa--harness-developer.netlify.app

[santoshdodamani]

LGTM