[test] Make `enableSuspenseyImages` dynamic (#36274) #1956

Job	Run time
Cache Runtime, Compiler node_modules	1d 0h 0m 0s
Discover flow inline configs	1d 0h 0m 0s
Cache Runtime node_modules	1d 0h 0m 0s
yarn build and lint	0s
Test eslint-plugin-react-hooks	0s
Process artifacts combined	0s
Check flags	0s
Run fixtures Flight tests	0s
Confirm generated inline Fizz runtime is up to date	0s
yarn test-build	0s
Flow check ${{ matrix.flow_inline_config_shortname }}	0s
yarn test ${{ matrix.params }} (Shard ${{ matrix.shard }})	0s
Check fixtures DOM (stable)	0s
yarn test-build (devtools)	0s
Run sizebot	-1s
Build DevTools and process artifacts	-1s
Merge DevTools artifacts	-1s
Search build artifacts for unminified errors	-1s
Run DevTools e2e tests	-1s
Check release dependencies	-1s
	2d 23h 59m 54s

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