test: add test1546, chunked not last transfer encoding

with more than one transfer-encoding, 'chunked' must be the last added
to the writer stack (and therefore the first to decode). RFC

test: add test1546, chunked not last transfer encoding

with more than one transfer-encoding, 'chunked' must be the last added
to the writer stack (and therefore the first to decode). RFC 9112, ch.
6.1.

Closes #13736

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