Polkadot Opengov tests

[muharem]

Test cases:

• open HRMP channels, Collectives <> Statemint
• set_desired_candidates on Stateming from RelayChain as StakingAdmin
• init the Fellowship on Collectives from RelayChain as FellowshipAdmin
• whitelist call on RelayChain from Collectives as Fellows
• resume_xcm_execution on Statemint from Collectives as Fellows

[NachoPal]

To be consistent with the rest of the tests could you use result pattern instead of attributes?

It is less verbose and easier to see the expected results.

[muharem]

To be consistent with the rest of the tests could you use result pattern instead of attributes?

It is less verbose and easier to see the expected results.

I will create a different PR for it

[NachoPal]

Do not remove --state-cache-size=0 it is essential to avoid having to add delays between actions making the tests more slow