chore: remove primary-alt colors

[daibhin]

Problem

Cleaning up our colors

Changes

Didn't look like these ones were used. Triggering snapshots to make sure

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

How did you test this code?

[github-actions[bot]]

Size Change: 0 B

Total Size: 1.07 MB

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `frontend/dist/toolbar.js` | 1.07 MB |

_{compressed-size-action}

[posthog-bot]

📸 UI snapshots have been updated

7 snapshot changes in total. 0 added, 7 modified, 0 deleted:

• chromium: 0 added, 7 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.