Gus Wynn

### Motivation ### Tips for reviewer ### Checklist - [ ] This PR has adequate test coverage / QA involvement has been duly considered. ([trigger-ci for additional test/nightly runs](https://trigger-ci.dev.materialize.com/)) -...

Closes #26965 cc @morsapaes We only want to commit to the fact that if a keys partition _only increases_, then we do the right thing. ### Motivation - tests/verification ###...

Currently sources that hydrate on restart (`UPSERT` and `DEBEZIUM`) prevent new values from being buffered until the source is hydrated; This is problematic when some sources hydrated faster than others...

storage: commit to some ordering between partitions in UPSERT

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A key changing the partition (right now, specifically Kafka partitions) is considered not supported by `UPSERT` sources, for good reason: there is no defined order between partitions, so the order...

enhancement(kubernetes_logs source): add container_start_time to k8s_logs

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This adds the container start time to the `kubernetes_logs` source. While `container_id` helps distinguish between different instances of the same container, it does not clarify the time-order of these container....