Compute cascading tags server-side

[schustmi]

Describe changes

When having a cached step, we were computing/updating the cascading tags from a pipeline run through the client. For a single tag and output artifact, this would send 4 requests:

• One to try to fetch the tag by name
• One to create the tag with the same name, even if the first request already succeeded
• Another one the fetch the tag by name, in case the second request failed (which it does in most cases)
• Another one to the batch tag resource endpoint, but only with a single tag/resource

This would happen for each cascading tag, and for each output artifact.
Just as a small example, for our stress test pipeline, which has 20 output artifacts and 10 cascading tags, this would be 800 requests for a single step.

With the new kubernetes orchestrator pod caching, this caching code is running in multiple threads. In my experiment, I was running with 30 threads, but this could be more. This caused an insane load on the server just for adding some tags.

This PR handles the same logic server-side, which reduces the amount of requests to 0.

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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