Add contextual information from PSM about DSCs

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Integrations with 3rd parties usually requires some sort of meta data about each DSC that is not readily available via the logs - i.e. labels, names, etc. This information is, however, stored in PSM.
Utilizing a combination of object webhooks in PSM's APIs and an intermediary bit of code, we can update the metadata for all DSCs under mgmt of PSM in the elasticsearch DB. This can then be used for log enrichment at ingest time.