CORE-6175 Added metadactyl.analyses/pre-process-jex-submission.

The metadactyl.analyses.base/build-submission function now includes an 'input' array for every step (see commit 8f2779076e67eba8889200d1caae96bfdfca7beb) so that the batch logic can look for path-list files for FAPI jobs too.
The metadactyl.analyses/do-jex-submission function will now remove the 'input' array from FAPI job steps before submitting to the JEX.