Retire the "Streamlined Publication Approval" system #856

I believe that Streamlined Publication Approval is unused.

The motivation for this Process feature is described at the begining of the section:

In order to streamline the publication process in non-controversial cases, verification of an update request is automatically granted without formal review when the following additional criteria are fulfilled: […]

Note: These criteria are intentionally stricter than the general requirements for an update request. This is in order to minimize ambiguities and the need for expert judgment, and to make self-evaluation practical.

In practice, nobody has found it useful to place the additional burden on themselves to document that all additional criteria are fulfilled in order to save a little bit of time by spiking verification of the update request, nor requested improved tooling to make that easier. (@plh, could you confirm?)

We should admit that this is a failed experiment, and remove it from the Process. Rules about REC track transitions are complicated enough without confusing people with irrelevant clauses.