build

[Rust] Refactor union case handling #1581

Job	Run time
Check that solution can be restored	31s
build-typescript	2m 21s
build-integration	3m 1s
build-python (ubuntu-latest, 3.10)	2m 48s
build-rust (default)	3m 11s
build-javascript (ubuntu-latest)	3m 57s
build-python (ubuntu-latest, 3.11)	2m 40s
build-rust (no_std)	3m 16s
build-javascript (windows-latest)	6m 41s
build-standalone	5m 5s
build-python (ubuntu-latest, 3.12)	2m 49s
build-rust (threaded)	9m 38s
build-python (windows-latest, 3.10)	3m 58s
verify-linting	24s
build-python (windows-latest, 3.11)	4m 35s
analyzers	4m 54s
build-python (windows-latest, 3.12)	4m 27s
build-dart	1m 54s
	1h 6m 10s

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