Merge build.yml and release.yml into a single ci.yml and update test …

…matrix

Merging build and release wf together avoids a lot of duplicated (but not always synchronized) code.

We build now
- for python 3.8 -> 3.11
- on macos-12 (to avoid arm64 issues at build), windows-latest, and ubuntu-latest

We test
- with python 3.8 and 3.11 only
- on macos-12 (x86_64), macos-latest(arm64), windows-latest,
  ubuntu-latest

With the last ray release, the dependency conflict has been solved for
windows + python 3.11, so we stop skipping it.