Runtime does unnecessary account cloning when obtaining the executable accounts

[jackcmay]

Problem

The loading program and executable accounts are done independently and may duplicate account cloning if an executable account is also passed as a parameter. This is due to an old assumption that there was no overlap between executable accounts and parameter accounts. With cross-program invocations, executable accounts may be passed as parameters and exist in both the executable and program accounts as separate cloned accounts.

This duplicate account cloning also occurs in the cross-program invocation call flow since it uses the same data types as typical transaction processing.

Proposed Solution

Use Rc and RefCell to share a single copy and eliminate the extra cloning. Once the new data types are used in the typical transition processing call flow update cross-program invocations and remove the unnecessary clone there too.

[jackcmay]

Fixed via #14574