chore: add an opt-in count to early access management

[joethreepwood]

Problem

I want to know who is opted in to each feature, but I don't want to click in to each feature one by one.

Wouldn't it be nice if a LOWLY PRODUCT MARKETER could add a column to the early access management table to show the number of opted-in users for each feature?

(A: Yes, but it'd be nicer if his Macbook was capable of running a local version so he can test it)

Changes

Tries to add a nice column of opted in users to the early access management table.

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

How did you test this code?

[greptile-apps]

PR Summary

Added opt-in count functionality to early access features management table, allowing users to see the number of users opted into each feature without navigating to individual feature pages.

• Added optional opt_in_count field to EarlyAccessFeatureType interface in /frontend/src/types.ts
• Implemented new "Opted-in users" column with sorting in /products/early_access_features/frontend/EarlyAccessFeatures.tsx
• Added API calls in /products/early_access_features/frontend/earlyAccessFeaturesLogic.ts to fetch opt-in counts, though N+1 queries could impact performance
• Consider optimizing the API calls by implementing a bulk fetch endpoint to reduce the number of requests

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