Allow Cython compilation to open a web browser containing the annotated HTML file #17371

Job	Run time
test-new	10m 13s
test-long (src/sage/[a-f]*)	1m 1s
test-mod (sagemath_categories-check)	3m 59s
test-long (src/sage/[g-o]*)	36m 31s
test-long (src/sage/[p-z]*)	34m 57s
test-long (src/doc src/sage_docbuild src/sage_setup)	11m 11s
coverage-report	16m 9s
	1h 54m 1s

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