chore: move member joined notification to user settings pt 1

[ReeceJones]

Problem

The member joined notification is in the wrong spot. This PR is 1/2 PRs to migrate this setting from organization settings to user settings.

Changes

• Update backend logic to check individual user settings to determine which users should receive new joiner notification
• Update frontend to move the setting from organization settings and introduce new section in user notification settings

How did you test this code?

Tests + Manualyl

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

Publish to changelog?

Docs update

[github-actions]

Size Change: +9.2 kB (+0.01%)

Total Size: 124 MB

Filename	Size	Change
frontend/dist/exporter.js	20.1 MB	+1.85 kB (+0.01%)
frontend/dist/render-query	19.8 MB	+1.85 kB (+0.01%)
frontend/dist/render-query.js	19.8 MB	+1.85 kB (+0.01%)
frontend/dist/toolbar	9.49 MB	+1.85 kB (+0.02%)
frontend/dist/toolbar.js	9.49 MB	+1.85 kB (+0.02%)

ℹ️ View Unchanged

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[github-actions]

Storybook visual regression tests failed

If your changes intentionally update UI snapshots: add the update-snapshots label, then re-run the workflow. Snapshots will be auto-committed.

If you didn't change any UI: this is likely a flaky snapshot — wait for a fix to land on master.