Prepopulate zero lamport accounts in store_for_tests

[roryharr]

Problem

Zero lamport single ref accounts do not need to be added to the index or the slot_cache, but many tests rely on them being added.

Summary of Changes

• Modify store_for_tests to pre-populate zero lamport accounts to ensure they get added to the slot_cache/index

Fixes #

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.6%. Comparing base (a79a700) to head (ab8b682).
⚠️ Report is 14 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10061       +/-   ##
===========================================
+ Coverage    70.9%    82.6%    +11.6%     
===========================================
  Files         711      844      +133     
  Lines      211507   316660   +105153     
===========================================
+ Hits       150014   261608   +111594     
+ Misses      61493    55052     -6441     

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