computed root building: synchronize log to remote in case of failure

When materializing a computed root fails, the error is reported
as a reference (in form of a blob identifier) to the log. This
indirection is necessary as many roots are, in general materialized
simultaneously. When building remotely, also upload the build log
to remote execution; in this way, it is available in the same way
as for serve-build failures (which are the other delegated builds).
One particular use case is if the failure happens on a CI build;
then the upload ensures the actual log is still available for the
observer of the CI (provided they have access to the remote execution
used by the CI).

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