CI - Adds more tests for memops syscalls

[Lichtso]

Problem

We only have tests for the non_contiguous (using iter_memory_pair_chunks) version of these syscalls, which become relevant when the bpf_account_data_direct_mapping feature is active.

Summary of Changes

Adds success and failure tests of memcpy, memmove, memcmp, memset in the "normal" contiguous cases (which are expected to fail at memory region boundaries).

[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

All modified and coverable lines are covered by tests ✅

Project coverage is 82.7%. Comparing base (4b0dc70) to head (1847be8).

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #6318     +/-   ##
=========================================
- Coverage    82.7%    82.7%   -0.1%     
=========================================
  Files         845      845             
  Lines      377724   377879    +155     
=========================================
+ Hits       312732   312758     +26     
- Misses      64992    65121    +129     

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