CI: optimize workflow for security updates #57654

Job	Run time
Check if tests should run	2s
Build	-1s
${{ matrix.constel }}-${{ matrix.timezone }}	0s
${{ matrix.constel }}-${{ matrix.kind }}	0s
${{ matrix.constel }}-firefox	0s
${{ matrix.constel }}-no-csp	0s
${{ matrix.constel }}-chrome	0s
Send notifications	0s
	1s

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