Refactor average remediation times

[Hubtrick-Git]

Adapted the frontend types to the data structure returned by the api and adjusted the data parsing of the repository overview accordingly

[Copilot]

Pull request overview

This PR updates the frontend to match a new API response shape for “average remediation/fixing time” stats, and refactors the asset repository overview page to fetch and display the new structure.

Changes:

• Introduces a new AllAverageFixingTimes API type to represent averages for all severities and both risk/CVSS modes.
• Refactors the asset version overview page to fetch average fixing times with a single SWR request instead of one request per severity.
• Adjusts chart input parsing by mapping the new response fields into the existing AverageFixingTimeChart prop shape.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/types/api/api.ts	Adds AllAverageFixingTimes to represent the updated API response structure for average fixing times across severities/modes.
src/app/(loading-group)/[organizationSlug]/projects/[projectSlug]/assets/[assetSlug]/refs/[assetVersionSlug]/page.tsx	Switches from 4 SWR calls to 1 and maps the new response into per-severity chart props.

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