program-test: Prohibit setting the compute unit limit past i64::MAX

[joncinque]

Problem

As reported by users, setting u64::MAX for the max compute units in solana-program-test causes all sBPF tests to fail: https://discord.com/channels/428295358100013066/774014770402689065/1136270266436173886

This happens because the rbpf vm actually represents compute unit budget with a i64 in order to catch using too many units, so if we set anything larger than i64::MAX, the compute units becomes negative, which immediately errors.

Summary of Changes

While it may be better to change everything to use i64 and match the vm, this would allow people to set negative numbers for their program's compute units, which we'll need to properly define.

Once that work is done, we can expose a new function on solana-program-test which accepts an i64. In the meantime, add a debug assertion to help users fix the problem themselves.

Fixes #

[codecov]

Codecov Report

Merging #32807 (8cf5d52) into master (3dcb382) will increase coverage by 0.0%.
Report is 70 commits behind head on master.
The diff coverage is 0.0%.

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##           master   #32807   +/-   ##
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  Coverage    82.0%    82.0%           
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  Files         785      785           
  Lines      211100   211102    +2     
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+ Hits       173170   173187   +17     
+ Misses      37930    37915   -15