test(e2e): improve jobs assignment on CI nodes
test(e2e): improve jobs assignment on CI nodes

With the previous algorithm, some nodes have no jobs assigned to them due to rounding consideration.
For example with 10 nodes and 13 jobs to assign:
 13 jobs / 10 nodes -> 1.3 jobs per node -> rounded to 2 -> only the 1st 6 nodes run 2 jobs, the 7th 1 job and the other 0 job.

Using a modulo ensures that each node will at least run 1 job.

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