fix: Plugin Hog function migrator

[benjackwhite]

Problem

• Tried this out and immediately crashed hard due to OOM
• Also noticed that some legacy plugins have orgs without the required addon so we need to bypass this logic to get it to work

Changes

• Reworks the migration script to be loading as little info as possible
• Logs out teams in this special case without the addon
• Corrects some of the ways fields were loaded

👉 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]

Hey @benjackwhite! 👋
This pull request seems to contain no description. Please add useful context, rationale, and/or any other information that will help make sense of this change now and in the distant Mars-based future.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: posthog/cdp/migrations.py

Function	Unhandled Issue
migrate_legacy_plugins	ValidationError: {"inputs":{"googleCloudKeyJson":"Value must be a string."}} posthog.cdp.migratio... Event Count: 1

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