Migrate Incentives from WBTC.axl to WBTC pools

Bumping this topic due to the rewrite and WBTC liquidity becoming initially available on Osmosis.
By the time we have VSG gauges live (Create Volume Splitting Gauges for Native WBTC pools) this should be ready to propose.

Have adjusted the original proposal to:

  • Use VSGs instead of single pools since those weren’t available at the time of writing
  • Rather than a 4:1 split, the first move allocates 25% and 25% to OSMO/WBTC and WBTC/STABLE with the second moving entirely to OSMO/WBTC, resulting in a 3:1 split.