Document rationale for disallowing clear state program inner transactions

[michaeldiamant]

Summary

Adds inline comment explaining how the team decided to drop support for inner transactions in a clear state program.

• Relates to Inner clearstate #3556.
• Consider the PR optional. As a new team member, I felt the comment benefits future readers' comprehension. If folks feel the explanation is obvious, then I welcome closing the PR.

Test Plan

N/A - Only changes comments.

[codecov-commenter]

Codecov Report

Merging #3586 (73ff06b) into feature/contract-to-contract (9fca1ee) will increase coverage by 0.01%.
The diff coverage is n/a.

@@                       Coverage Diff                        @@
##           feature/contract-to-contract    #3586      +/-   ##
================================================================
+ Coverage                         47.76%   47.78%   +0.01%     
================================================================
  Files                               370      370              
  Lines                             60258    60258              
================================================================
+ Hits                              28783    28792       +9     
+ Misses                            28171    28163       -8     
+ Partials                           3304     3303       -1     

Impacted Files	Coverage Δ
data/transactions/logic/eval.go	85.69% <ø> (ø)
network/wsNetwork.go	62.79% <0.00%> (-0.20%)	⬇️
ledger/acctupdates.go	66.60% <0.00%> (+0.18%)	⬆️
catchup/service.go	70.12% <0.00%> (+0.49%)	⬆️
network/requestTracker.go	71.12% <0.00%> (+0.86%)	⬆️
data/abi/abi_type.go	88.62% <0.00%> (+0.94%)	⬆️
network/netprio.go	78.26% <0.00%> (+8.69%)	⬆️

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