fix(teamProjects): Migrate api.request to useMutation

[sentry]

This PR addresses the `no-callback-api-request` linter warning in `static/app/views/settings/organizationTeams/teamProjects.tsx`.

The handleLinkProject function was using the deprecated callback-style api.request for linking/unlinking projects. This has been migrated to use TanStack Query's useMutation hook, leveraging fetchMutation for the API call.

• The api.request call has been replaced with a useMutation instance.
• Success and error handling logic (refetching, ProjectsStore updates, and toast messages) have been moved into the onSuccess and onError callbacks of the mutation.
• The useApi hook and the api instance are no longer needed in this component and have been removed.
• Added the <Project> type argument to fetchMutation to ensure type safety for the response data passed to ProjectsStore.onUpdateSuccess.

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Fixes FRONTEND-TSC-31