feat(messaging): different types of hog functions

[mariusandra]

Problem

Splitting up #25719

Changes

• PR 1 - migration and backend split
  • Migration to add type to the HogFunction model. Type will be set to destination for all existing functions.
  • The plugin server only runs destination functions on events, but also loads email functions (shared provider code) into memory.
  • The backend returns hog functions based on type, and the frontend only asks for destination
  • Tests for all of the above

How did you test this code?

• Added tests to make sure we can list with a type filter
• Added tests to make sure the plugin server only looks at destinations
• Updated existing tests to use the new type field
• Clicked around the interface and I could still edit/create/update existing destinations as before

[github-actions]

Size Change: +36 B (0%)

Total Size: 1.15 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.15 MB	+36 B (0%)

_{compressed-size-action}

[posthog-bot]

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[posthog-bot]

📸 UI snapshots have been updated

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[posthog-bot]

📸 UI snapshots have been updated

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• chromium: 0 added, 4 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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[posthog-bot]

📸 UI snapshots have been updated

2 snapshot changes in total. 0 added, 2 modified, 0 deleted:

• chromium: 0 added, 2 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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