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 like "All Users".
• Capability contexts, where we're describing a capability, like "Can Push" or cases in Applicaitons. In these cases, we link all policies to the full policy explanation flow.

Test Plan:

• Used bin/policy show to examine the policy of an object with a project policy, no longer saw HTML.
• Viewed the transaction logs of Applications (ModularTransactions) and Tasks (not ModularTransactions) with policy edits, including project and custom policies.
• Clicked "Custom Policy" in both logs, got consistent dialogs.
• Viewed application detail pages, saw all capabities linked to explanatory capability dialogs. The value of having this dialog is that the user can get a full explanation of special rules even if the policy is something mundane like "All Users".

Maniphest Tasks: T13411

Differential Revision: https://secure.phabricator.com/D20804