Remove TodoFunction and TodoProtocols workarounds #3136

Job	Run time
Check MSRV	53s
Check formatting	39s
Lint macOS x86_64	2m 25s
Lint iOS ARMv7s	2m 18s
Lint visionOS Aarch64 simulator	2m 33s
Lint GNUStep + exceptions	1m 25s
Lint header-translator	25s
Lint test-assembly	25s
Test macOS 15 Aarch64	1m 56s
Verify header translator output	52s
Assembly tests	51s
Check framework features	0s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test Compiler-RT	24s
Test GNUStep with libobjc2 v1.9	1m 8s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	1m 4s
Compiler UI	47s
Test GNUStep with libobjc2 v2.1 on nightly	58s
Test GNUStep 32bit	1m 37s
	20m 40s

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