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`labgrid_test` causes ExecutionError due to empty program_prefix for root level targets

When running a labgrid_test target which is in a BUILD.bazel file at the root of the module, a failure similar to this can be seen:

INFO: From Testing //:cat-release:
==================== Test output for //:cat-release:
/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/openssh~/scp: dest open "/tmp/tmp.NSukY64cv1-EXECROOT/''/cat.sh": No such file or directory
/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/openssh~/scp: failed to upload file /tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/_main/cat.sh to /tmp/tmp.NSukY64cv1-EXECROOT/''/cat.sh
Traceback (most recent call last):
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/_main/../rules_labgrid~/labgrid/run/_run_stage2_bootstrap.py", line 411, in <module>
    main()
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/_main/../rules_labgrid~/labgrid/run/_run_stage2_bootstrap.py", line 407, in main
    _run_py(main_filename, args=sys.argv[1:])
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/_main/../rules_labgrid~/labgrid/run/_run_stage2_bootstrap.py", line 266, in _run_py
    runpy.run_path(main_filename, run_name="__main__")
  File "<frozen runpy>", line 291, in run_path
  File "<frozen runpy>", line 98, in _run_module_code
  File "<frozen runpy>", line 88, in _run_code
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/_main/../rules_labgrid~/labgrid/run/__main__.py", line 138, in <module>
    entry()
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/_main/../rules_labgrid~/labgrid/run/__main__.py", line 134, in entry
    exit(main(Path(argv[0]), *argv[1:]))
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/_main/../rules_labgrid~/labgrid/run/__main__.py", line 114, in main
    return run(
           ^^^^
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/rules_labgrid~/labgrid/run/run.py", line 26, in run
    r.put(uploads)
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/rules_labgrid~/bazel/labgrid/runner/runner.py", line 91, in put
    self._transfer.put(local, remote)
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/rules_python~~pip~rules_labgrid-labgrid-3.11_311_labgrid/site-packages/labgrid/binding.py", line 102, in wrapper
    return func(self, *_args, **_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/rules_python~~pip~rules_labgrid-labgrid-3.11_311_labgrid/site-packages/labgrid/step.py", line 215, in wrapper
    _result = func(*_args, **_kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/rules_python~~pip~rules_labgrid-labgrid-3.11_311_labgrid/site-packages/labgrid/driver/sshdriver.py", line 508, in put
    raise ExecutionError(
labgrid.driver.exception.ExecutionError: error executing command: ['/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/openssh~/scp', '-S', '/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/openssh~/ssh', '-o', 'LogLevel=ERROR', '-F', 'none', '-o', 'ControlPath=/tmp/lg-ssh-dsoqoghv/control-*.*.*.*', '-P', '22', '-r', PosixPath('/tmp/home/.cache/bazel/user/aa8becc1cf038ad66d33573a40643e89/sandbox/processwrapper-sandbox/575/execroot/_main/bazel-out/k8-fastbuild-ST-3dd539271c19/bin/cat-release.runfiles/_main/cat.sh'), "user@*.*.*.*:/tmp/tmp.NSukY64cv1-EXECROOT/''/cat.sh"]

The main issue here is with the constructed path /tmp/tmp.NSukY64cv1-EXECROOT/''/cat.sh as there are some empty quotes where the program_prefix goes.

As this is in the root of the MODULE the prefix is empty and the current handling of that causes the empty single quotes to be added to the path rather than not being added at all.

The expectation would be to have the program be located at /tmp/tmp.NSukY64cv1-EXECROOT/cat.sh.