svm: remove redundant runtime environment clone

[radik878]

Before this change we cloned the program runtime environment twice per load call (once at the call site and again inside load_program_from_bytes), which was unnecessary because Arc cloning is already done when passing the environment in.
Removed the redundant internal clone so the runtime environment is moved into ProgramCacheEntry::new/reload without extra refcount churn.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.6%. Comparing base (590832c) to head (b07e34d).

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #10119     +/-   ##
=========================================
- Coverage    82.6%    82.6%   -0.1%     
=========================================
  Files         845      845             
  Lines      317132   317132             
=========================================
- Hits       262005   262001      -4     
- Misses      55127    55131      +4     

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