Eliminate proposal "filtering" in favor of throwing hard errors #1462

Job	Run time
AsyncBuildAndTest (ubuntu-latest)	1m 38s
SyncBuildAndTestS (ubuntu-latest)	2m 6s
AsyncBuildAndTest (macos-latest)	1m 30s
SyncBuildAndTestS (macos-14)	2m 23s
AsyncBuildAndTest (windows-latest)	11m 25s
SyncBuildAndTestS (windows-latest)	13m 47s
CodeCoverage	4m 27s
LintAndFormatting	27s
LintAndFormattingMacOS	32s
	38m 15s

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