This has become an unnecessary time-wasting paper cut for me.

Because Stéfan was worried that PRs from outside contributors are red
due to the label check failing, I propose to get rid of that too.
changelist makes it transparent if PRs aren't labeled, and it's very
trivial to cleanup PR labels just before the release... (I'm doing that
anyway).

Also less config to maintain.

* origin/main: (27 commits)
  Move `_shared` to `_skimage2` (#8102)
  Port `pad_footprint` & `mirror_footprint` to `skimage2` (#8094)
  Add rescaling API to skimage2 (#8075)
  Move `skimage2` implementation into `_skimage2` (#8093)
  Undo (double) mirroring in `ski2.morphology.dilation` (#8060)
  Grammar (#8091)
  Move `ensure_spacing` into `skimage2` (#8067)
  Ensure that `skimage2` does not eagerly import `skimage` (#8087)
  Use lazy-loader 0.5 (#8080)
  MAINT: make ellipse fitting forward compatible  (#8054)
  Avoid deprecated assign to ndarray.shape (#8020)
  Avoid circular import in `feature/corner.py` (#8077)
  Turn off coderabbit auto-labeling & label checks (#8070)
  Fix GIL being re-enabled by C++ extensions (#8059)
  Fix conventions following docstub and misc. (#8055)
  Port grayscale morphology operators to skimage2 (#8046)
  Add revised `peak_local_max` to `skimage2` (#8039)
  Allow read-only arrays as input to remap (#7535)
  Add `prescale`  parameter to "blob functions" (#7858)
  Try to make coderabbit respect exisiting type labels (#8042)
  ...