chore(data-warehouse): Condensed joins UI

[Gilbert09]

Problem

• We had tabs in the data warehouse scene, one for the tables and another for managing joins
• We want to move the warehouse stuff into data pipelines 3000, and so getting rid of the joins tab would make the transition much easier

Changes

• Condensed the joins UI and logic into the tables views
• Can edit and delete joins from the table (from the individual columns)
  • Works on both posthog and warehouse tables
• Removed the Joins tab and relevant components

https://github.com/PostHog/posthog/assets/1459269/61e0da23-dcec-4d2e-82ae-2b71c8ba5550

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

Yes

How did you test this code?

Browser clicks

[github-actions[bot]]

Size Change: 0 B

Total Size: 1.05 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.05 MB

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[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.

[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.

[posthog-bot]

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