chore: remove SUBSCRIBE_TO_ALL_PRODUCTS ff

[zlwaterfield]

## Changes

This PR removes the subscribe to all products ff, assumes everyone has access and shows the UI based on the subscription level of free, paid or custom.

👉 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?

Tested manually

[posthog-bot]

📸 UI snapshots have been updated

26 snapshot changes in total. 0 added, 26 modified, 0 deleted:

• chromium: 0 added, 20 modified, 0 deleted (diff for shard 1, diff for shard 2)
• webkit: 0 added, 6 modified, 0 deleted (diff for shard 2)

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[github-actions]

Size Change: -54 B (-0.01%)

Total Size: 1.06 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.06 MB	-54 B (-0.01%)

_{compressed-size-action}

[raquelmsmith]

A couple snapshot issues - you can decide if these should be fixed before moving everyone over to it 👍

[raquelmsmith]

Looks like the data that powers this snapshot should be fixed - seems like FFs and surveys aren't subscribed, so they don't show the amount due.

[raquelmsmith]

Oops, looks like this doesn't work in dark mode. People can get to dark mode in onboarding if they have an account first - but idk if the initial experience allows them to use dark mode or defaults into light mode?

[posthog-bot]

📸 UI snapshots have been updated

5 snapshot changes in total. 0 added, 5 modified, 0 deleted:

• chromium: 0 added, 5 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.

[posthog-bot]

📸 UI snapshots have been updated

6 snapshot changes in total. 0 added, 6 modified, 0 deleted:

• chromium: 0 added, 6 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.

[posthog-bot]

📸 UI snapshots have been updated

4 snapshot changes in total. 0 added, 4 modified, 0 deleted:

• chromium: 0 added, 4 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.

[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

Triggered by this commit.

👉 Review this PR's diff of snapshots.