80a4437f33
This deprecates `save=False` for several functions and removes all known usages of the parameter but does not actually remove the parameter. Instead, it will emit a deprecation warning if the parameter is used. We can remove the parameter as soon as we feel sure nothing is using it. Now that we have refactored `anonymous_id_for_user` to always prefer retrieving an existing ID from the database -- and observed that only a small fraction of calls pass save=False -- we can stop respecting save=False. This opens the door for future improvements, such as generating random IDs or switching to the external user ID system. Metrics: I observe that 1 in 16 requests for new, non-request-cached anon user IDs are made with save=False. But 71% of all calls are served from the request cache, and 99.7% of the misses are served from the DB. save=False only appear to come from intermittent spikes as reports are generated and are low in absolute number. Also document usage/risk/rotation of secret in anonymous user ID generation as indicated by `docs/decisions/0008-secret-key-usage.rst` ADR on `SECRET_KEY` usage. ref: ARCHBOM-1683
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