feat: 2fa management on settings page

[zlwaterfield]

Problem

Our 2FA experience is not good, we use a pre generated server side UI that's buggy and doesn't let users view, generated or rolled backup codes or disable 2FA

Changes

This PR updates all the 2FA functionality to be on the PostHog user settings page (view backup codes, generate backup codes, disable 2FA)

Before:

After:

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

It doesn't have an impact.

How did you test this code?

Manually and behind ff.

[posthog-bot]

Hey @zlwaterfield! 👋 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.

[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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[raquelmsmith]

Amazing

[posthog-bot]

📸 UI snapshots have been updated

3 snapshot changes in total. 0 added, 3 modified, 0 deleted:

• chromium: 0 added, 3 modified, 0 deleted (diff for shard 1, diff for shard 2)
• webkit: 0 added, 0 modified, 0 deleted

Triggered by this commit.

👉 Review this PR's diff of snapshots.

[github-actions[bot]]

Size Change: -448 B (-0.04%)

Total Size: 1.16 MB

ℹ️ View Unchanged

| Filename | Size | Change | | :--- | :---: | :---: | | `frontend/dist/toolbar.js` | 1.16 MB | -448 B (-0.04%) |

_{compressed-size-action}

[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 2)
• webkit: 0 added, 0 modified, 0 deleted

Triggered by this commit.

👉 Review this PR's diff of snapshots.