Allow running header-translator on just one framework at a time #3449

Job	Run time
Lint macOS x86_64	4m 46s
Lint iOS ARMv7s	4m 34s
Check formatting	12s
Check MSRV	1m 3s
Lint visionOS Aarch64 simulator	4m 29s
Lint GNUStep + exceptions	1m 45s
Lint header-translator	35s
Lint test-assembly	29s
Test macOS 15 Aarch64	2m 29s
Verify header translator output	4m 8s
Assembly tests	57s
Check framework features	0s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test Compiler-RT	31s
Test GNUStep with libobjc2 v1.9	1m 17s
Compiler UI	47s
Test GNUStep with libobjc2 v2.0	1m 31s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.1 on nightly	1m 3s
Test GNUStep 32bit	1m 15s
	31m 51s

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