oeqa/postactions: Separate artefact collection from test result collection

Combining the test result collection and artefact collection hasn't worked out
well as the data has different life cycles, the artefacts can be large and
we need to be able to clean them up on a different timescale.

Separate them out to be controlled by a separate variable, OEQA_ARTEFACT_DIR.
Also rework the code to inject a directory with a date/time and random component
to allow builds to run in parallel. Pass function arguments to avoid re-reading
variables.

(From OE-Core rev: e1cf7e94c3fcbe7dbc29e4286f0e1014b95964a9)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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