fix: missing cost tools in project scoped mode

[gregnr]

In project scoped mode, we remove account-level tools that aren't relevant. We had previously removed the get_cost and confirm_cost tools in this mode since create_project is no longer relevant, however create_branch still is relevant and cost confirmation is required for that tool.

This PR adds back the following tools in project scoped mode:

• get_cost
• confirm_cost
• get_project (to get details about the scoped project)