[7.x] [Alerting] retry internal OCC calls within alertsClient (#77838) #78688
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During development of elastic#75553, some issues came up with the optimistic concurrency control (OCC) we were using internally within the alertsClient, via the `version` option/property of the saved object. The referenced PR updates new fields in the alert from the taskManager task after the alertType executor runs. In some alertsClient methods, OCC is used to update the alert which are requested via user requests. And so in some cases, version conflict errors were coming up when the alert was updated by task manager, in the middle of one of these methods. Note: the SIEM function test cases stress test this REALLY well. In this PR, we wrap all the methods using OCC with a function that will retry them, a short number of times, with a short delay in between. If the original method STILL has a conflict error, it will get thrown after the retry limit. In practice, this eliminated the version conflict calls that were occurring with the SIEM tests, once we started updating the saved object in the executor. For cases where we know only attributes not contributing to AAD are being updated, a new function is provided that does a partial update on just those attributes, making partial updates for those attributes a bit safer. That will be also used by PR elastic#75553.
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Backports the following commits to 7.x: