feat: overrides in the relayer to force collateral warp route mints to be read-only

[tkporter]

Description

Some context, and the fix for future warp routes: #4905

This will force messages to certain collateral warp route recipients to have mint accounts as readonly. This is a first step toward requiring lower fees for some txs.

An example of Helius fees for a USDC process that includes the USDC mint as writeable:

{"jsonrpc":"2.0","result":{"priorityFeeLevels":{"min":0.0,"low":292041.0,"medium":2207571.0,"high":10405557.0,"veryHigh":22996019.0,"unsafeMax":2000000000.0}},"id":"1"}

vs when it's not writeable:

{"jsonrpc":"2.0","result":{"priorityFeeLevels":{"min":0.0,"low":0.0,"medium":1.0,"high":150000.0,"veryHigh":10000000.0,"unsafeMax":2000000000.0}},"id":"1"}

The alternative to having this PR would be to:

• keep marking mints as writeable, forcing us to overpay
• or do a program upgrade of the warp routes (unlikely to happen)

Drive-by changes

• Removed #[allow(warnings)] from mailbox.rs and made required changes

Related issues

Backward compatibility

Testing

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Latest commit: 9503411

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.53%. Comparing base (17ecb97) to head (9503411).
Report is 3 commits behind head on main.

Additional details and impacted files

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##             main    #4918   +/-   ##
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  Coverage   77.53%   77.53%           
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  Files         103      103           
  Lines        2110     2110           
  Branches      190      190           
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  Hits         1636     1636           
  Misses        453      453           
  Partials       21       21           

Components	Coverage Δ
core	87.80% <ø> (ø)
hooks	79.39% <ø> (ø)
isms	83.68% <ø> (ø)
token	91.27% <ø> (ø)
middlewares	79.80% <ø> (ø)