Throughput decrease checker; submit build $OPTIONS to grafana

Fail publish throughput jobs and add a hlt1-throughput-decreased label if:

• The averaged throughput change goes below a certain value (see .gitlab-ci.yml, where this variable is set, currently -2.5%)
• The throughput change for any device goes below a (looser) value of -7.5%

The throughput percentage change is calculated from the speedup, using this simple formula

        change = (speedup - 1.0) * 100.0

i.e. a speedup of 0.96x translates to a -4% change.

cc @dovombru