Remove the title prop from analytics visualizations

What does this MR do and why?

This MR removes the title prop from the Visualization model and all hardcoded config files for Remove title property and update the slug to th... (#415467 - closed). It also updates the Visualization model to generate the slug from the filename as we do for dashboards.

Screenshots or screen recordings

No visual changes.

How to set up and validate locally

1. Follow these instructions to setup Product Analytics in GDK. Ensure product_analytics_snowplow_support feature flag is enabled.
2. View the dashboards listing page at Project -> Analyze -> Application Analytics.
3. Onboard Product Analytics by clicking on set up and following the onboarding process.
4. Enable custom dashboards on the project at Project > Settings > General > Analytics.
5. Go back to the dashboards listing page at Project -> Analyze -> Application Analytics.
6. Open the Visualization designer view and create a new custom visualization.
7. Open the New dashboard view and create & save a dashboard with the newly created visualization.
8. Verify that the new dashboard and dashboard listing renders as expected.

MR acceptance checklist

• I have evaluated the MR acceptance checklist for this MR.

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