fix(generator): allow end states from choice states in the initial state transition path

[finger563]

Description

This updates the code generator so that end states that are reachable from the initial state are handled properly.

Motivation and Context

Previously, if you had an initial state which went (e.g. via a choice pseudostate) to an end state for that substate, they would not generate properly.

This code fixes that.

How has this been tested?

Modeled up this simple toy case:

Model:
choice_end_test.webgmexm.zip

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

Here is the execution trace for the model under various conditions:

Showing regular end state usage (coming from another / sibling state) still works

Showing that initial state resolution to end state transitions out accordingly

Note the starting and final states are the same:

Generated code:
Choice_End_Test_generatedCode.zip

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Software change

Checklist:

• My change requires a change to the documentation.
• I have added / updated the documentation related to this change via either README or WIKI

Software

• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.