feat(cdp): Added legacy plugins worker

[benjackwhite]

Problem

We want to fast migrate off of plugins to HogFunctions and one way we can do this is by just inlining the plugins and using HogFunctions as the base layer for the actual work

Changes

• Adds the plugin worker which simulates the plugin server

TODO

• Detect these "plugin" destinations and queue to cyclotron as "plugin"
• Add migration command (will test properly and have follow up work for sure
• Collect logs
• Fix for customer.io person checking (we could just use persons instead and remove the storage)

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

Does this work well for both Cloud and self-hosted?

How did you test this code?

[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

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

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[github-actions]

Size Change: 0 B

Total Size: 1.16 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.16 MB

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[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

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

Triggered by this commit.

👉 Review this PR's diff of snapshots.

[meikelmosby]

couple of nits but overall lgtm

[pl]

I reviewed the worker part, but skipped the actual plugin code and migrations, as I'm still out of depth on that.

Changes to the worker LGTM.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ValidationError: {"inputs":{"googleCloudKeyJson":"Value must be a string."}} posthog.cdp.migrations in migrate_legacy_plugins View Issue
• ‼️ SyntaxError: '(' was never closed (migrations.py, line 17) posthog.management.commands.migrate_plugins_to_... View Issue

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