refactor(playgorunds): rearranging the code structure #2028

Job	Run time
canary	0s
forkless-update-no-data	0s
forkless-update-data	0s
try-runtime	0s
collator-selection	0s
governance	0s
node-only-update	0s
unit-test / develop	8m 38s
yarn-dev / opal	19m 8s
yarn-dev / sapphire	28m 27s
xcm / Prepare execution matrix	29s
yarn-dev / quartz	28m 12s
yarn-dev / unique	19m 2s
codestyle / rustfmt	12s
codestyle / yarn_eslint	29s
codestyle / clippy	2m 25s
xcm / opal-build	1h 20m 38s
xcm / quartz-build	2h 6m 18s
xcm / unique-build	2h 10m 35s
	7h 24m 33s

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