Field-based node properties
This updates mtime node property code to match https://github.com/bazelbuild/remote-apis/pull/128
Depends on https://gitlab.com/BuildGrid/buildbox/buildbox-common/-/merge_requests/269 and buildbox-casd!176 (merged)
This updates mtime node property code to match https://github.com/bazelbuild/remote-apis/pull/128
Depends on https://gitlab.com/BuildGrid/buildbox/buildbox-common/-/merge_requests/269 and buildbox-casd!176 (merged)