Rollup merge of #144254 - ognevny:opt-dist-artifact-dir, r=Kobzol

opt-dist: make `artifact-dir` an absolute path for `opt-dist local`

...like for CI environments. the same logic applied as for `build_dir`. fixes the issue where some intermediate steps fail due to path being relative to an active directory

r? Kobzol

try-job: dist-x86_64-msvc
try-job: dist-x86_64-linux

Author: jieyouxu