Add tree artifact metadata for the coverage post-processing spawn, Rewrite paths of writable directories that are under the execroot, Always add containing trees of input tree file artifacts to the metadata map

[iancha1992]

Commit IDs

c48392c, bc1d9d3, b0db044

Category

team-Local-Exec

Reviewers

@lberki

[bazel-io]

The following commits were cherry-picked in #20819: b0db044.
Failed commits (likely due to merge conflicts): c48392c, bc1d9d3

The failed commits are NOT included in the PR. Please resolve manually.
cc: @bazelbuild/triage

[bazel-io]

The following commits were cherry-picked in #20820: b0db044.
Failed commits (likely due to merge conflicts): c48392c, bc1d9d3

The failed commits are NOT included in the PR. Please resolve manually.
cc: @bazelbuild/triage