As a user, I want to group by multiple fields in the Test Runs list gadget

Description
Currently, the Test Runs list gadget only supports grouping by a single field at a time. Users need the ability to group test runs by multiple fields (e.g., by Status and Assignee, or by Build and Environment) to better analyze and organize results.

User friction
Users struggle to get meaningful insights when dealing with large sets of test runs. Single-field grouping forces them to manually scan or export data to understand relationships across multiple dimensions.

Steps to reproduce (right now) / Actual Result:
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• Open the Test Runs list gadget.
• Attempt to group results using available grouping options.
• Select one grouping field (e.g., Status).
• Try to add another grouping level (e.g., Assignee).

IMPACT
Limits data visibility and makes it harder to analyze test execution trends across multiple parameters, especially in complex projects.

What would improve if solved:
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• Better data organisation and readability
• Faster analysis of test runs

Impact on stakeholders:
Better visibility into failures across dimensions

Current workaround:
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• Apply filters repeatedly for different gadget cards.

CONTEXT & EXAMPLES:
Multi-level grouping is commonly available in reporting tools and dashboards, allowing users to drill down into data hierarchies (e.g., Status → Assignee → Environment).

Concrete example:
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A user wants to view test runs grouped by:

• Label
• Components

Currently, they can only group by one of these at a time.

Workaround risk:

Using multiple cards on the dashboard