Make --nobuild_runfiles_links work in combination with --run_under #14471
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When both of these flags are provided, we must make sure that a "bazel
run" forcefully instantiates the runfiles directories both for the
target to run, and the --run_under target. Right now it only ensures
this for the former, which causes execution errors along the lines of:
Cannot find .runfiles directory for /some/path
This code alters the existing code block that ensures that runfiles
exist to loop over the entire set of targets. We do need to capture the
path of the runfiles directory of the target to run, as it may need be
used as the working directory later on.