Replace MAPL_GridCompSpecs_ACG.py with MAPL_GridCompSpecs_ACGv3.py in MAPL3

[darianboggs]

Types of change(s)

• 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 change)
• Trivial change (affects only documentation or cleanup)
• Refactor (no functional changes, no api changes)

Checklist

• Tested this change with a run of GEOSgcm
• Ran the Unit Tests (make tests)

Description

For MAPL 3, I created a new script, MAPL_GridCompSpecs_ACGv3.py, to perform automatic code generation, while MAPL 2 continues to use MAPL_GridCompSpecs_ACGv.py for the same function. This prevented merges from MAPL 2 from overwriting the MAPL 3 automatic code generation. This required adding an argument in CMakeLists.txt to specify which ACG to use. Now that MAPL 3 is more mature, and we are not merging from MAPL 2, we no longer need to keep two versions of ACG in MAPL 3.

This PR:

1. removes the MAPL 2 version of ACG,
2. renames MAPL_GridCompSpecs_ACGv3.py to MAPL_GridCompSpecs_ACG.py so that the MAPL 3 automatic generation is performed for any existing calls to MAPL_GridCompSpecs_ACG.py
3. removes the argument in CMakeLists.txt for calling MAPL_GridCompSpecs_ACGv3.py.

Related Issue

[darianboggs]

Added @tclune and @mathomp4 as reviewers for their feedback