Cleanup: invoke_context.rs

[Lichtso]

Problem

Follow up of #22102, which left some inefficiencies to be optimized.

Summary of Changes

• Replaces Message::new(&[instruction.clone()], None) by a custom instruction_account compilation logic.
• Removes message::Message from invoke_context.rs completely (including the tests).
• Simplifies sol_invoke_signed() of program-test.
• Removes InvokeContext::find_index_of_account().
• Start search for non program accounts at front (instead of the back).

Fixes #

[codecov]

Codecov Report

Merging #22107 (5f3bd0c) into master (2ab4f34) will decrease coverage by 0.0%.
The diff coverage is 50.0%.

@@            Coverage Diff            @@
##           master   #22107     +/-   ##
=========================================
- Coverage    81.3%    81.2%   -0.1%     
=========================================
  Files         519      519             
  Lines      145736   145732      -4     
=========================================
- Hits       118500   118469     -31     
- Misses      27236    27263     +27