Add RegionX Cocos

[Szegoo]

This PR is a request to add the RegionX test parachain called 'Cocos' to Polkadot.js.

[TarikGul]

Looks like the ordering just needs to be updated:

Test networks:: RegionX Cocos needs to be before Rhala Testnet

[Szegoo]

@TarikGul I updated the order

[TarikGul]

Looks like another ordering issues, It is kind of silly but it does 1 level at a time, so maybe run yarn test locally after fixing it or try to see where the it should be manually in the order.

[Szegoo]

@TarikGul Checked with yarn test locally, should be good now.