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`labgrid_test#env` cannot resolve long string

Attmpting to use a JSON Web Token in labgrid_test#env fails because we attempt to resolve all env values with Python runfiles:

Traceback (most recent call last):
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/_main/../rules_labgrid+/labgrid/executor/_executor_stage2_bootstrap.py", line 474, in <module>
    main()
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/_main/../rules_labgrid+/labgrid/executor/_executor_stage2_bootstrap.py", line 468, in main
    _run_py_path(main_filename, args=sys.argv[1:])
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/_main/../rules_labgrid+/labgrid/executor/_executor_stage2_bootstrap.py", line 284, in _run_py_path
    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 "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/_main/../rules_labgrid+/labgrid/executor/executor.py", line 125, in <module>
    entry()
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/_main/../rules_labgrid+/labgrid/executor/executor.py", line 121, in entry
    exit(main(Path(argv[0]), *argv[1:]))
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/_main/../rules_labgrid+/labgrid/executor/executor.py", line 107, in main
    env = {k: resolve(v) for k, v in parsed.env}
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/_main/../rules_labgrid+/labgrid/executor/executor.py", line 107, in <dictcomp>
    env = {k: resolve(v) for k, v in parsed.env}
              ^^^^^^^^^^
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/_main/../rules_labgrid+/labgrid/executor/executor.py", line 25, in resolve
    return str(runfile(value))
               ^^^^^^^^^^^^^^
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/rules_labgrid+/bazel/python/runfiles/runfiles.py", line 18, in runfile
    if resolved and Path(resolved).exists():
                    ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/execroot/_main/external/rules_python++python+python_3_11_x86_64-unknown-linux-gnu/lib/python3.11/pathlib.py", line 1235, in exists
    self.stat()
  File "/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/execroot/_main/external/rules_python++python+python_3_11_x86_64-unknown-linux-gnu/lib/python3.11/pathlib.py", line 1013, in stat
    return os.stat(self, follow_symlinks=follow_symlinks)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 36] File name too long: '/home/matt-clarkson/.cache/bazel/_bazel_matt-clarkson/027531265d81431aefe131e3e1653ff9/sandbox/linux-sandbox/238/execroot/_main/bazel-out/k8-fastbuild-ST-df5a81c7fd6a/bin/test/labgrid/labgrid.runfiles/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNzA4MzQ1MTIzLCJleMjM0NTY3ODkwIiIzLCJleHAiOjE3MDgzNTUxMjN9IzLCJleHAiOjE3MDgzNTUxMjIzLCJleHAiOjE3MDgzNTUxMjIzLCJleHAiOjE3MDgzNTUxMjIzLCJleHAiOjE3MDgzNTUxMjIzLCJleHAiOjE3MDgzNTHAiOjE3MDgzNTUxMjN9MjM0NTY3ODkwIiITUxMjIzLCJleHAiOjE3MDgzNTUxMjIzLCJleHAiOjE3MDgzNTUxMj.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c'