Update sparkle icon system

[uiuxxx]

The API was recently updated and the orange sparkles are being used for any pool with yield in addition to regular swap fees. This has caused some confusion.

Let's update the sparkles to the following:

I have set up a new PR, where I have:

• Added new light and dark mode sparkles colors
• Added new 'Single star' to display pool's with swap fees only.

#1110

Tasks remaining:

1. Single star icon
   • Assign the new uploaded single star icon StarIcon.tsx to display only when a pool has no other yield beyond swap fees.
   • Use the gray colors already defined in the defaultGrad
2. Gray sparkles icon
   • This icon with the usual 3 stars should be assigned to any pool with yield in addition to swap fees, but with no staking yield.
3. Orange sparkles
   • This will now only be used to denote pools with staking incentives (could be BAL or other staking incentives)
4. Gold sparkles icon
   • Bring back the gold sparkles icon for the BAL / WETH 80/20 pool (it got lost with the recent API update)