Add new ModelPacks component

[charisk]

Adds a new ModelPacks React component to show the model packs used during an evaluation run. This is not used anywhere yet - it will be wired up in a follow up PR.

Checklist

N/A:

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[shati-patel]

Looks good ✨