test1683: remove commented-out check alternatives

Python precheck/postcheck alternatives were included but commented out.
Since these are not used and perl is guaranteed to be available

test1683: remove commented-out check alternatives

Python precheck/postcheck alternatives were included but commented out.
Since these are not used and perl is guaranteed to be available to run
the perl versions anyway, the Python ones are removed.

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tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

curl: add --no-clobber

Does not overwrite output files if they already exist

Closes #7708
Co-authored-by: Daniel Stenberg