Remove instructions_count property from patterns.json

[goerlibe]

Currently the instructions_count is not aggregated into parent CUs. This leads to instructions_count being 0 in the patterns.json.

Since this information is not useful, it should be removed.

The other option: aggregating the values of the children would lead to helpful results. We decided against this option, because we can achieve similar results by aggregating the workload - which we already do.