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Improve long testvector test result presentation

The nightly run of the long testvector test should be summarized in a better way, perhaps using gitlab pages. The summary should

Clearly mark crashes
Show history/diff from previous run

Draft steps:

Change mld.csv from the jobs to be prefixed with the job name and commit SHA.
Adapt ci/get_id_of_last_job_occurence.py to run on BASOP repo -- inject the repo URL somewhere.
Replicate the log storage behavior used in the complexity reports.
Create script to generate nice looking web page or similar to be presented on gitlab pages.