R1:506f93b4a390

Give policy name rendering explicit "text name", "capability link", and "transaction link" pathways

Summary:
Ref T13411. This cleans up policy name rendering. We ultimately render into three contexts:

- Plain text contexts, like `bin/policy show`.
- Transaction contexts, where we're showing a policy change. In these cases, we link some policies (like project policies and custom policies) but the links go directly to the relevant object or a minimal explanation of the change. We don't link policies…