test: cmd: Add gzwrite chunk boundary regression test

Add a deterministic regression test for the gzwrite() case where a
decompression input chunk is exhausted at exactly the same time as
the write buffer fills up. Build a gzip file by hand from two 1 KiB
stored deflate blocks and pick a chunk size that covers exactly the
first block header plus its payload, so that with a 1 KiB write
buffer the first input chunk runs out precisely when the write buffer
is full.

Unlike the existing random data test, which only hits this corner
case for rare byte patterns (about 1 percent of runs on sandbox64),
this test fails 20 out of 20 runs without the preceding gunzip fix:

  Error: inflate() returned -5

and passed 100 out of 100 runs with it.

Signed-off-by: Aristo Chen <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

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