programs: Resolve Rust 1.88 clippy lints and format strings

[steviez]

Problem

Working towards #6850, broken out from #6910

Summary of Changes

For the programs directory:

• Run cargo clippy --fix --tests with Rust 1.88.0 set in rust-toolchain.toml
• Run cargo fmt with format_strings = true set in rustfmt.toml

[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.24390% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.2%. Comparing base (4807a7a) to head (2d34383).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #6961     +/-   ##
=========================================
- Coverage    83.2%    83.2%   -0.1%     
=========================================
  Files         856      856             
  Lines      376390   376402     +12     
=========================================
- Hits       313281   313269     -12     
- Misses      63109    63133     +24     

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