## Explanation

To remove our dependency on AccountsController and use the new BIP-44
enabled AccountTreeController, this PR contains two main changes:

- Swaps out the listener `AccountsController:selectedAccountChange` for
`AccountTreeController:selectedAccountGroupChange`
- Swaps out the action `AccountsController:getSelectedAccount` for
`AccountTreeController:getAccountsFromSelectedAccountGroup` from which
we derive the EVM-compatible account

This relies on the latest 0.12.1 release of the account-tree-controller
package.

Small things of note:
- The account listener no longer needs the account payload to update the
account address as the race condition of concern [has been
fixed](#5555) (this is relevant to
mention still because despite using the new AccountTreeController event,
it still uses AccountsController under the hood)
- In the new `getSelectedEvmAccount()` function I initially handled the
case of no account being found (which shouldn't be possible) by failing
early with a 'No EVM-compatible account address found' error. But on
seeing how this case is handled by consuming functions (sometimes
returning early, sometimes returning empty objects, sometimes throwing
error) I opted to keep it consistent with the current code

## References

Fixes the core side of this issue:
https://consensyssoftware.atlassian.net/browse/TAT-1315?atlOrigin=eyJpIjoiMmQ2MDY1ZjQ4MDU5NDdiYmJhMjRhYzNiMThhMjEwYzIiLCJwIjoiaiJ9

And should be tested alongside the accompanying mobile repo update:
MetaMask/metamask-mobile#19160

## Checklist

- [x] I've updated the test suite for new or updated code as appropriate
- [x] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [x] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/contributing.md#updating-changelogs),
highlighting breaking changes as necessary
- [x] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes