Detect unmatched skip begin/end commands #1862

Job	Run time
test-advanced-any / linux-job	15m 46s
test-advanced-cpu / linux-job	15m 44s
test-evaluation-any / linux-job	4m 22s
test-evaluation-cpu / linux-job	4m 20s
test-gguf-any / linux-job	15m 48s
test-gguf-cpu / linux-job	15m 48s
test-quantization-any / linux-job	16m 2s
test-quantization-cpu / linux-job	15m 58s
test-readme-any / linux-job	8m 15s
test-readme-cpu / linux-job	8m 13s
	2h 0m 16s

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