cleanup: remove impressions worker

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What does this PR do?

🤖 Generated by Copilot at 12a5a1f

Refactored the Leafwatch worker to handle both web app and service worker data ingestion and removed the Impressions worker. Updated the web app, service worker, data package, and documentation to reflect the changes in the worker endpoints and ports.

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

🤖 Generated by Copilot at 12a5a1f

• Consolidate impression tracking logic in Leafwatch worker and remove Impressions worker (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Rename ingest handler to events and register /events route in leafwatch/src/index.ts (link, link, link)
• Rename impressions/src/handlers/ingest.ts to leafwatch/src/handlers/impressions.ts and register /impressions route in leafwatch/src/index.ts (link, link, link)
• Update impressionsEndpoint constant in service-workers/index.ts to point to /impressions route of Leafwatch worker (link)
• Delete Impressions worker files and remove entry from docs/ports.md (link, link, link, link, link, link, link, link, link, link, link)
• Update web app to send response data to /events route of Leafwatch worker (link)
• Adjust ports for Sitemap, Features, and Pro workers and update documentation and configuration files accordingly (link, link, link, link, link)

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