Unnecessary evictions on rdd collect

For robustness regarding potential OOMs we already have functionality for guarded collects that write the RDD to hdfs and read it into memory instead of collect because the latter requires twice the memory of a simple read. However, there are scenarios, where we collect an RDD and because its size exceeds the buffer pool, we immediately evict to local file system in a single-threaded manner. This task aims to consolidate this and use the guarded collect whenever the data is known to exceed the buffer pool size.