These chatd tests are flaking for the same stale control-notification
race tracked by CODAGT-353, so this change skips the newly reflaking
advisor-chain and `TestPatchChatMessage/ChangesModel` tests and rewrites
the older `TODO(hugodutka)` skips to point at the same root cause. This
keeps the known flakes documented consistently until the chatd
notification-flow refactor lands.
Closes CODAGT-427
Closes https://github.com/coder/internal/issues/1510