Account for yieldFeeBalance in twabSupplyLimit

[trmid]

The TWAB supply limit is expected to never be reached in a prize vault, but if a deployer makes a mistake or if the underlying asset has a highly fluctuating total supply, it's possible that it can be. In this case, the accrued yield fee balance must be protected so that the yield fee funds can't be locked in by depositors.

These changes ensure that the yield fee balance is always accounted for in the TWAB total supply limit and ensures that no new mints, deposits or liquidations can occur if they will exceed this limit.

[linear]

GEN-1231 [M-91/M-244] Twab supply limit should account for unrealized yield fee balance shares

[github-actions]

LCOV of commit a0045fa during coverage #504

Summary coverage rate:
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  functions..: 100.0% (56 of 56 functions)
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Files changed coverage rate:
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  src/PrizeVault.sol          |99.5%    182| 100%    45|    -      0

[github-actions]

LCOV of commit 478a5d9 during coverage #513

Summary coverage rate:
  lines......: 99.5% (215 of 216 lines)
  functions..: 100.0% (55 of 55 functions)
  branches...: no data found

Files changed coverage rate:
                              |Lines       |Functions  |Branches    
  Filename                    |Rate     Num|Rate    Num|Rate     Num
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  src/PrizeVault.sol          |99.5%    186| 100%    44|    -      0