[GIP-269] Adjustment to Incentive Budget allocation

## Summary This proposal aims to adjust and clarify several parameters of the original [Permissionless upgrade proposal](https://snapshot.box/#/s:gearbox.eth/proposal/0x8f0b13b93c7cc40981b4156a16b1aca26cd556ed125722ce3eb13b59c487515a). The main reasons for this update are: - Feedback received from multiple curators regarding the initial design; - The actual migration schedule, which turned out to be non-simultaneous across asset types — with ETH pools active for nearly a month, while stable...