Program Test: Overwrite builtin when program ID matches

[buffalojoec]

Problem

In order to test the Core BPF version of a builtin program, we need to be able to overwrite the existing builtin with the Core BPF version using solana-program-test.

Since ProgramTest::new() will call Self::default(), which automatically determines prefer_bpf based on the SBF_OUT_DIR, this will result in prefer_bpf = true for the provided program. This will cause the provided Core BPF program to be overwritten by the existing builtin when the bank is set up.

Summary of Changes

Add a check to ProgramTest::new() that will set prefer_bpf to false if the provided program ID matches that of a builtin. With prefer_bpf set to false, the Core BPF version of the program will replace the existing builtin during ProgramTest::start().

Note: @Lichtso I've rebased this commit on top of your recent PR #35233 since it requires the changes you've made to LoadedPrograms::assign_program().

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 81.7%. Comparing base (6ee3bb9) to head (17a0400).
Report is 21 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #35242    +/-   ##
========================================
  Coverage    81.7%    81.7%            
========================================
  Files         834      834            
  Lines      224299   224817   +518     
========================================
+ Hits       183361   183843   +482     
- Misses      40938    40974    +36     

[2501babe]

is there something is pr does than cant be accomplished by

let mut program_test = ProgramTest::default();
program_test.prefer_bpf(false);