[Co-staking] - remove window.dispatchEvent

[gbarkhatov]

Switch from window.dispatchEvent introduced in this PR: #357 to a proper context/state

The basic idea is that we need to query with GET the /v2/apr endpoint:

• once we stake BTC (API data + local storage). Local storage -> we are not counting verified, but instead the ones that were signed + submitted to BTC
• once we stake BABY

In both cases this is needed since back-end is not immediately aware of user staked BTC or BABY

window.dispatchEvent was introduced to overcome the context issue and simplify the consumption of back-end data for co-staking split and calculations

The outcome of this ticket should be the same:

• once we stake BTC we receive the feedback in the co-staking CTA modal after staking, with updated A%, B%, X
• once we stake BABY we immediately fetch the updated data, and see the X on baby route/tab
• rewards also work as expected, showing the split, able to claim, etc.

This issue requires #357 to be merged first