Make Interpreter::execute and friends generic over predicate-ness

[Dentosal]

Force monomorphization of the execute family of functions over predicate vs non-predicate execution. This allows optimizing a branch from the hot VM main loop.

Originally from FuelLabs/fuel-core#2767 (comment).

Also bumps Rust version in CI to 1.81.0.

Checklist

• Breaking changes are clearly marked as such in the PR description and changelog
• New behavior is reflected in tests
• If performance characteristic of an instruction change, update gas costs as well or make a follow-up PR for that
• The specification matches the implemented behavior (link update PR if changes are needed)

Before requesting review

• I have reviewed the code myself
• I have created follow-up issues caused by this PR and linked them here

[xgreenx]

It looks like you swapped boolean variables=D