enable fmt_module tests by updating module-test.cc (#4702)

- Update g++ module testing to use g++ version 15 instead of 14.
  The module support in version 14 isn't very stable and the module
  testing was not working due to unresolved locale symbols.
- Update CI for linux and macos to add verbosity so its consistent with
  windows.
- Refactor test/CMakeLists.txt to enable testing for modules
- The tests in `module-test.cc` seem to not have been updated in some
  time despite changes in the main library.
- Wide String versions of several tests appear to be deprecated so have
  been removed.
- Refactored tests related to `fmt::format_args` that now requires lvalue
  references as opposed to direct values.
- Remove the none-working code identified in the `module-test.cc` file
  while updating.

.github/workflows/linux.yml

@@ -37,10 +37,10 @@ jobs:
             std: 23
             install: sudo apt install g++-13
             shared: -DBUILD_SHARED_LIBS=ON
-          - cxx: g++-14
+          - cxx: g++-15
             build_type: Release
             std: 23
-            install: sudo apt install g++-14
+            install: sudo apt install g++-15
             gen: Ninja
           - cxx: clang++-3.6
           - cxx: clang++-11
@@ -147,7 +147,7 @@ jobs:
     - name: Add repositories for newer GCC
       run: |
         sudo apt-add-repository ppa:ubuntu-toolchain-r/test
-      if: ${{ matrix.cxx == 'g++-13' || matrix.cxx == 'g++-14' }}
+      if: ${{ matrix.cxx == 'g++-13' || matrix.cxx == 'g++-15' }}
 
     - name: Install LLVM-20
       run: |
@@ -200,6 +200,6 @@ jobs:
 
     - name: Test
       working-directory: ${{runner.workspace}}/build
-      run: ctest -C ${{matrix.build_type}}
+      run: ctest -C ${{matrix.build_type}} -V
       env:
         CTEST_OUTPUT_ON_FAILURE: True

.github/workflows/macos.yml

@@ -53,6 +53,6 @@ jobs:
 
     - name: Test
       working-directory: ${{runner.workspace}}/build
-      run: ctest -C ${{matrix.build_type}}
+      run: ctest -C ${{matrix.build_type}} -V
       env:
         CTEST_OUTPUT_ON_FAILURE: True