Replace 'use MAPL' with 'use MAPL2' in GEOS_Shared for MAPL→MAPL2→MAPL3 rename

[tclune]

Summary

• Replaces all bare use MAPL with use MAPL2 in 8 Fortran source files in GEOS_Shared/
• Adds MAPL2 to CMake DEPENDENCIES in GEOS_Shared/CMakeLists.txt

These changes support the transitional MAPL→MAPL2→MAPL3 rename being coordinated across GEOS-ESM repos.

References

• Closes Replace 'use MAPL' with 'use MAPL2' in GEOS_Shared for MAPL→MAPL2→MAPL3 rename #413
• Part of the broader release/MAPL-v3 / MAPL #4600 rename effort

[gmao-rreichle]

@tclune : Do we still have both libraries (MAPL and MAPL2) somehow in the system (per Line 11 of the CMakeLists.txt file)?

[mathomp4]

Sigh. The build issue is on me. I forgot to merge a previous @tclune PR (#412 )

[mathomp4]

Wait. the CI is weirdly wrong. One moment.

[tclune]

@tclune : Do we still have both libraries (MAPL and MAPL2) somehow in the system (per Line 11 of the CMakeLists.txt file)?

@gmao-rreichle Yes. We are whittling away the MAPL2 stuff that can be deleted and migrating the stuff that can't. So this step really is just a name change to make the name "MAPL" default to the MAPL v3.0 stuff that will survive. All the use MAPL2 stuff will need attention before we can release v3.0. (But the real work is all the layers of the GCM that are simply commented out on the MAPL3 branch.)