In #2257 the usage of NoteExecutionHint in NoteMetadata (in miden-protocol) was moved to NetworkAccountTarget (in miden-standards). NoteExecutionHint is still defined in miden-protocol but should now move to miden-standards since there is no longer a reason to have it in protocol and now conceptually belongs to the "network account target" standard.

So, the task here is to move it to crates/miden-standards/src/note/execution_hint.rs.