[8.8.0] Share one RunfilesTreeUpdater per command across spawn strategies

[bazel-io]

Forked from #29901

[bazel-io]

Cherry-pick was attempted but there were merge conflicts in the following file(s). Please resolve manually.

src/main/java/com/google/devtools/build/lib/exec/BUILD
src/main/java/com/google/devtools/build/lib/exec/RunfilesTreeUpdater.java
src/main/java/com/google/devtools/build/lib/runtime/BUILD
src/test/java/com/google/devtools/build/lib/runtime/BlazeRuntimeTest.java

cc: @bazelbuild/triage

[iancha1992]

Cherry-pick was attempted but there were merge conflicts in the following file(s). Please resolve manually.

src/main/java/com/google/devtools/build/lib/exec/BUILD src/main/java/com/google/devtools/build/lib/exec/RunfilesTreeUpdater.java src/main/java/com/google/devtools/build/lib/runtime/BUILD src/test/java/com/google/devtools/build/lib/runtime/BlazeRuntimeTest.java

cc: @bazelbuild/triage

cc: @lberki @tjgq @fmeum