fix(tar): append slash to top-level directory mtree entries #4522

Job	Run time
matrix-prep	4s
test (7, 7.1.2, 1, ubuntu, local, .)	5m 17s
test (7, 7.1.2, 1, ubuntu, local, e2e/copy_action)	19s
test (7, 7.1.2, 1, ubuntu, local, e2e/copy_to_directory)	44s
test (7, 7.1.2, 1, ubuntu, local, e2e/coreutils)	25s
test (7, 7.1.2, 1, ubuntu, local, e2e/external_copy_to_directory)	49s
test (7, 7.1.2, 1, ubuntu, local, e2e/smoke)	53s
test (7, 7.1.2, 1, ubuntu, local, e2e/write_source_files)	16s
test (7, 7.1.2, 0, ubuntu, local, .)	3m 58s
test (7, 7.1.2, 0, ubuntu, local, e2e/copy_action)	26s
test (7, 7.1.2, 0, ubuntu, local, e2e/copy_to_directory)	43s
test (7, 7.1.2, 0, ubuntu, local, e2e/coreutils)	20s
test (7, 7.1.2, 0, ubuntu, local, e2e/external_copy_to_directory)	38s
test (7, 7.1.2, 0, ubuntu, local, e2e/smoke)	44s
test (7, 7.1.2, 0, ubuntu, local, e2e/write_source_files)	15s
test (6, 6.5.0, 0, ubuntu, local, .)	1m 8s
test (6, 6.5.0, 0, ubuntu, local, e2e/copy_action)	18s
test (6, 6.5.0, 0, ubuntu, local, e2e/copy_to_directory)	49s
test (6, 6.5.0, 0, ubuntu, local, e2e/coreutils)	15s
test (6, 6.5.0, 0, ubuntu, local, e2e/external_copy_to_directory)	1m 1s
test (6, 6.5.0, 0, ubuntu, local, e2e/smoke)	41s
test (6, 6.5.0, 0, ubuntu, local, e2e/write_source_files)	21s
	20m 24s

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