CI: reduce job waterfall for runtime test jobs #404

Job	Run time
Discover flow inline configs	5s
Flow check dom-node	44s
Flow check dom-node-webpack	47s
Flow check dom-node-turbopack	57s
Flow check dom-node-turbopack-bundled	50s
Flow check dom-bun	1m 1s
Flow check dom-browser	48s
Flow check dom-browser-esm	45s
Flow check dom-browser-turbopack	45s
Flow check dom-edge-webpack	1m 0s
Flow check dom-edge-turbopack	48s
Flow check dom-node-esm	51s
Flow check dom-legacy	53s
Flow check markup	54s
Flow check dom-fb	56s
Flow check native	57s
Flow check fabric	58s
Flow check test	54s
Flow check art	22s
Flow check custom	55s
	16m 10s

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