Rename VSD filterLabels variables

What does this MR do and why?

Existing names have caused some confusion, so rename them:

• rawFilterLabels > filterLabelsQuery
• filterLabels > filterLabelsResults

How to set up and validate locally

1. Feature.enable(:combined_analytics_dashboards)
2. Feature.enable(:vsd_graphql_dora_and_flow_metrics)
3. Setup YAML configuration
4. Seed analytics data (and optionally DORA metrics data)
5. Visit the value streams dashboard: http://gdk.test:3000/groups/${YOUR_GROUP}/-/analytics/dashboards
6. Apply some label filters to your YAML config file
7. Validate that the VSD is showing the expected labels on page load

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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

Related to #419869 (closed)