feat: migrate feeds worker to next api

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What does this PR do?

🤖[deprecated] Generated by Copilot at 687dddc

This pull request refactors and simplifies the feed provider and algorithm modules for the hey and k3l providers, and moves them from the workers package to the api package. It also replaces the deprecated feeds gateway with a new API endpoint /feed/getPublicationIds that returns publication IDs based on the feed parameters. It removes unused files, imports, parameters and constants related to the feeds gateway and the workers package.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖[deprecated] Generated by Copilot at 687dddc

• Add API endpoint /feed/getPublicationIds to return publication IDs based on feed parameters (link)
• Update feed algorithm modules to use relative imports and remove unused env parameter (link, link, link, link, link, link, link)
• Update heyFeed module to use relative imports, remove unused env parameter, and remove default case (link)
• Rename feed provider and helper modules from packages/workers/feeds to apps/api/utils/feeds (link, link, link)
• Delete unused files from packages/workers/feeds (link, link, link, link, link, link, link)
• Update lib module to use new API URL and endpoint for getting publication IDs (link, link)
• Remove unused constants and ports related to feeds gateway (link, link, link)

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