refactor: Small fixes to product analytics goals + layout

[rafaeelaudibert]

Follow-up to #28461

[greptile-apps]

PR Summary

This PR focuses on synchronizing frontend-only properties between frontend and backend code, particularly for insight visualizations. Here's a summary of the key changes:

• Added consistent handling of "Add filter group" buttons in InsightViz.scss with conditional display based on layout mode
• Synchronized frontend-only property filtering between queryUtils.ts and schema_helpers.py to maintain consistency
• Added support for goal lines in trends insights by including goalLines in visualization-only fields
• Updated display type handling with canonical values for chart categories
• Added explicit cross-references between frontend and backend code for property filtering

The changes appear well-structured and improve the maintainability of the codebase by keeping frontend-only properties consistently handled across the stack.

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[posthog-bot]

📸 UI snapshots have been updated

32 snapshot changes in total. 0 added, 32 modified, 0 deleted:

• chromium: 0 added, 16 modified, 0 deleted (diff for shard 2)
• webkit: 0 added, 16 modified, 0 deleted (diff for shard 2)

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[github-actions]

Size Change: 0 B

Total Size: 1.21 MB

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Filename	Size
frontend/dist/toolbar.js	1.21 MB

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[thmsobrmlr]

Changes look good, but it seems to have broken cypress tests @rafaeelaudibert

[rafaeelaudibert]

Changes look good, but it seems to have broken cypress tests @rafaeelaudibert

Yeah, fixing that now, had no power at home this morning. I just need to keep one of the buttons with the previous ID. Will fix soon, thanks for the stamp!