test: svm_inspect_account helpers

[2501babe]

Problem

AccountLoader inspects accounts every time load_account() is called. the svm_inspect_account test asserts that an account was inspected a specific number of times, in a specific order, with specific states, rather than a looser pattern where it only checks eg "this was inspected as write at least once." based on several previous conversations, it would be undesirable to relax either of these conditions

this means any time we change how AccountLoader is used in svm, this test breaks. there are several past and future prs that cause accounts to be inspected several times per transaction:

• program cache removed from account loader: program ids and loaders are inspected once more
• simd83 balance collection: every account is inspected twice more
• filter executable accounts fix: every account is inspected once more
• simd186 program data size fixes: it will change again but i dont know to what yet

every time this happens i have to go through the test again and fix it

Summary of Changes

add some helpers so i can just increment an integer when account inspection frequency changes

if youd rather change the test to .find() the records it needs in the actual inspections, id be happy to approve that pr. changing AccountLoader to only inspect accounts it gets from accounts-db is not an option, because it may load and inspect an account as read-only and then later take it as write

(the original draft of AccountLoader had a mechanism to avoid re-inspecting accounts, but we collectively decided to remove this since inspection is supposed to signal "svm is looking at this account btw" and its up to the implementor of the trait [in this case Bank] to decide whether it cares or not, hence why multiple inspection happens in the first place)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.0%. Comparing base (e7d3003) to head (c9e9a9d).
Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #5842     +/-   ##
=========================================
- Coverage    83.0%    83.0%   -0.1%     
=========================================
  Files         828      828             
  Lines      375623   375623             
=========================================
- Hits       311918   311915      -3     
- Misses      63705    63708      +3     

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[brooksprumo]

This impl looks good to me. As long as the accounts_lt_hash tests keep passing, I'm happy :)