[Fix] Mermaid gantt diagram scheduler time axis

Time axis displayed only "0 ms", probably due to a Mermaid update. Fix this by replacing "axis format %s" with "axis format %Q".

changed milestone to %v0.1.0

added 1 deleted label

requested review from @cmoineau

assigned to @pineapple

approved this merge request

enabled an automatic merge when the pipeline for 8ad565d6 succeeds

mentioned in commit 365bb132

merged