Vet profiles at write

[kolesnikovae]

It has been discovered that some of the persisted profiles may contain invalid samples (stack trace ID == 0). This indicates that the ingestion handling allows malformed profiles to be written to blocks. Additionally, the profile references a symdb partition that does not contain any information except strings related to sample types, which is unexpected.

To prevent the persistence of malformed profiles, several checks should be performed just before a profile is written to the parquet table. Discarded malformed profiles should be tracked via metrics.