add transcript with `edit.namespace` output for `base` and `http`

[aryairani]

Overview

A place to notice pretty-printing changes.

Implementation notes

Interesting/controversial decisions

• It takes a while to run, we may want to split them out into a different test that utilizes some codebase caching.
• It produces big output which may clog Github Actions log viewing.
• It doesn't try to round-trip them, as they would both fail.
• It's pinned to specific releases to avoid spurious output changes

Test coverage

Loose ends

Especially the caching thing.