Add noir-contracts to memory report

[TomAFrench]

We've cut memory usage significantly in recent pull requests so it may be doable to re-enable this metric.

[vezenovm]

Had this PR open already to check against a previous optimization #6809. Looks like it worked.

[TomAFrench]

#6809 shows a very large slowdown due to the use of heaptrack which makes it infeasible to run in CI on PRs. We should decide whether there's a subset of contracts which we're interested in benchmarking for and just run on that subset.