Elevate warnings to errors in tests, except DeprecationWarnings #3172

Job	Run time
Check for syntax errors	13s
Build sampledata archives	6m 50s
Run Workbench Tests (windows-latest)	12m 10s
Run Workbench Tests (macos-latest)	7m 29s
Run model tests (3.8, windows-latest)	15m 33s
Run model tests (3.8, macos-latest)	11m 15s
Run model tests (3.9, windows-latest)	12m 26s
Run model tests (3.9, macos-latest)	14m 24s
Run model tests (3.10, windows-latest)	13m 56s
Run model tests (3.10, macos-latest)	14m 27s
Build binaries (macos-latest)	45m 52s
Build binaries (windows-latest)	17m 45s
Check sdist (3.8, windows-latest)	7m 25s
Check sdist (3.8, macos-latest)	6m 51s
Check sdist (3.9, windows-latest)	8m 32s
Check sdist (3.9, macos-latest)	5m 21s
Check sdist (3.10, windows-latest)	7m 57s
Check sdist (3.10, macos-latest)	6m 28s
Validate Sampledata & User Guide	11m 13s
	3h 46m 7s

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