feat(APP-573): Add number of delegations metric for members

[milosh86]

Description

Adds the number of delegations metric to the token members list and member details page. The delegationCount field is exposed from the API and displayed in both the member list item and the member stats section.

Resolves APP-573.

Type of Change

• Major: Breaking change (change that would cause existing functionality to not work as expected)
• Minor: Feature (non-breaking change which adds new functionality)
• Patch: Enhancement (non-breaking change to an existing feature)
• Patch: Bug fix (non-breaking change which fixes an issue)

Developer Checklist:

• Manually smoke tested the functionality in a preview or locally
• Confirmed there are no new warnings or errors in the browser console
• (For User Stories only) Double-checked that all Acceptance Criteria are satisfied
• Confirmed there are no new warnings on automated tests
• Merged and published any dependent changes in downstream modules
• Selected the correct base branch
• Commented the code in hard-to-understand areas
• Followed the code style guidelines of this project
• Reviewed that the Files Changed in Github's UI reflect my intended changes
• Confirmed the pipeline checks are not failing

Review Checklist:

• (For User Stories only) Tested in a preview or locally that all Acceptance Criteria are satisfied
• Confirmed that changes follow the code style guidelines of this project

[linear]

APP-573 Add number of delegations metric for members

[github-actions]

🚀 Preview Deployment: View Here

[github-actions]

E2E Smoke Results

Base URL	https://app-next-j85wjf5im-aragon-app.vercel.app
Suite	smoke
Result	✅ passed
Run	#3915