[Epic] Replay: Load replay data on-demand about sentry HOT 6 OPEN

Context: mobile replays send video events. These video events are fetched independently of the RRWeb recording data. However, they're also stored separately.

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Option. On download call json.loads(downloaded_data), loop through the [events], extract the breadcrumb events and return, or extract the RRWeb events and return.

This would be backwards compatible but expensive (relative to: recv data -> stream to client).

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Option: On upload, store breadcrumb events and RRWeb events independently of one another. On request lookup the {filename}-rrweb file or the {filename}-breadcrumbs file based on the endpoint or query parameter. This improves performance on the API (recv data -> stream to client). Older files would not be split and would either need a backwards compatible fallback (following the option above) or the client would have to fetch the legacy files and split them locally.

This doubles the number of files we need to upload which will have an impact on consumer throughput. We could adopt an approach similar to my hackweek project to optimize this.

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We'll first investigate and confirm the root cause before going ahead with this change which is significant.

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Example crashes - https://github.com/getsentry/team-replay/issues/399

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Created a ticket specific to the investigation so we don't need ot commit to this solution:

• #65792

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