PGO: Reduce CPU profile size used for PGO

[1pkg]

Description

With the introduction of PGO in #13884, the initial produced CPU profile files seem to be too large, see this pull request for example. This is caused by collecting 100% of the samples in apm-perf and excessive tagging during the benchmarking. Such large profile files are not very well suited to be stored under git. Therefore we should optimize apm-perf to only collect a limited profile sample instead and discard all unnecessary tagging to reduce the size.