Fix pipeline

• Fix micromamba shell init on Windows: --prefix (-p) was renamed to --root-prefix (-r) in version 2.0. Both options were supported in 1.5.
• Remove boa. It's deprecated (to be replaced with rattler-build).
• Job on osx-arm64 was failing because it was installing omniorb from conda-forge which doesn't include omniidl (because of cross-compilation). Activating strict channel priority revealed a conflict with the version in tango-controls/label/omniorb_osx_arm64 and latest libopentelemetry-cpp due to libzlib. New build of omniorb is needed. See omniorb-feedstock!1 (merged)
• Still issue with compiler on windows. Allow job to fail so we can publish linux package.