Session GridField state manager #2514

Job	Run time
CI / Generate matrix	18s
CI / Context	1s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit framework-core	4m 30s
CI / 8.2 mariadb phpunit framework-core	5m 36s
CI / 8.3 mysql80 phpunit framework-core	6m 33s
CI / 8.1 prf-low mysql57 phpunit framework-orm	9m 47s
CI / 8.2 mariadb phpunit framework-orm	10m 53s
CI / 8.3 mysql80 phpunit framework-orm	11m 44s
CI / 8.1 prf-low mysql57 phpunit cms	1m 15s
CI / 8.2 mariadb phpunit cms	2m 44s
CI / 8.3 mysql80 phpunit cms	1m 54s
CI / 8.1 mysql57 phplinting	2m 21s
CI / Check unreleased changes	0s
CI / Patch release	0s
	57m 37s

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