Remove JSC support from CI (#5866) #12373

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	4s
detect-changes / Detect file changes	5s
diff_check / diff_check	4s
Build legacy macos production no-frameworks	6m 18s
Build new ios dev no-frameworks	10m 14s
Build legacy ios dev no-frameworks	9m 33s
Build legacy android dev no-frameworks	8m 33s
Build legacy ios dev dynamic-frameworks	9m 4s
Build legacy android production no-frameworks	10m 39s
Build legacy ios production no-frameworks	9m 40s
Build new android dev no-frameworks	11m 18s
Build legacy ios production dynamic-frameworks	9m 46s
Build legacy macos dev no-frameworks	6m 5s
Build new android production no-frameworks	13m 8s
Build new ios production no-frameworks	11m 10s
Test android production REV2	6m 4s
Test ios production REV2	4m 25s
	2h 6m 10s

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