Batch Snowplow events on gitlab.com

Problem

Two problems:

1. Verify batching is possible for #508460 (closed)
2. High load on Snowplow Collector endpoint

Desired Outcome

1. We find a way to batch events without losing any of them.
2. We reduce the Snowplow collector's workload.

Potential Solution

We can enable batching in two steps:

1. Enable POST requests instead of current GET
2. Enable batching

This should be done with feature flag, to avoid data loss.

Documentation Update Needed

• Yes
• No

How to verify

Further actions needed