* SQL Expressions: Add CASE/WHEN SQL nodes to allowlist
* Fixed and test for functions added in #102011
* Add remaining functions to the test-case
These are mostly aliases, so the LLM chose to omit them originally.
But adding now for completeness
* Fix ordering of allowed nodes
* Under feature flag `sqlExpressions` and is experimental
* Excluded from arm32
* Will not work with the Query Service yet
* Does not have limits in place yet
* Does not working with alerting yet
* Currently requires "prepare time series" Transform for time series viz
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Co-authored-by: Sam Jewell <sam.jewell@grafana.com>