Ensure query overrides apply to dora data source

What does this MR do and why?

This MR fixes namespace overriding for the dora metrics over time visualizations.

Passes through the rest of the queryOverride parameters to ensure we can customize the panel. By default the panel inherits the current namespace, but when customizing a dashboard via YAML we should be able to override this to view data for other namespaces.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

The after shot shows the comparison between a project and group, displaying different values.

Before	After

How to set up and validate locally

NOTE: You will need an GitLab Ultimate license

1. Create a group with 2 projects (one will be used for config, one for data)
2. Create a custom VSD following the customization instructions
3. Update the custom YAML configuration to include the DORA single stats, to compare the group and project values

   panels:
     # deployment frequency + lead time for our target group
    - visualization: deployment_frequency_over_time
      title: DF - group
      queryOverrides:
       namespace: <group-namespace>
      gridAttributes:
       yPos: 0
       xPos: 0
       width: 3
       height: 1
      options: {}     
    - visualization: lead_time_for_changes_over_time
      title: LT - group
      queryOverrides:
       namespace: <group-namespace>
      gridAttributes:
       yPos: 1
       xPos: 3
       width: 3
       height: 1
     # deployment frequency + lead time for our target project
    - visualization: deployment_frequency_over_time
      title: DF - testdata
      queryOverrides:
       namespace: <project-namespace>
      gridAttributes:
       yPos: 2
       xPos: 6
       width: 3
       height: 1
      options: {}      
    - visualization: lead_time_for_changes_over_time
      title: LT - testdata
      queryOverrides:
       namespace: <project-namespace>
      gridAttributes:
       yPos: 2
       xPos: 9
       width: 3
       height: 1

4. Seed VSD data for the group using the Value Streams Dashboard seed file
5. Seed VSD data for the project created for data using the Value Streams Dashboard seed file (Specify VSA_SEED_PROJECT_ID to set the project to seed data into)
6. Navigate to Analyze > Analytics dashboards in the left menu
7. Click on Value streams dashboard to view

Related to #442335 (closed)