Fix C++20 modules BMI configuration and stabilize external build tests

- Resolved Linux configuration mismatches (GNU extensions) by propagating CMAKE_CXX_EXTENSIONS and HPX_CXX_STANDARD to external tests.
- Fixed Windows installation crashes by removing CXX_MODULES_DIRECTORY from install(EXPORT) and adding MSVC guards for Clang linker flags.
- Improved module metadata propagation by explicitly linking HPXInternal module targets in external examples.
- Added CXX_STANDARD support to hpx_setup_target and applied it to hello_world_component.
- Skipped pkg-config tests when modules are enabled due to lack of BMI discovery support.
- Fixed CMake quoting and logic bugs in standard header collection.
- Applied project-wide clang-format and cmake-format to ensure CI compliance.

Author: arpittkhandelwal

.cmake-format.py

@@ -586,7 +586,7 @@
                                                     'INCLUDE_DIRS': '+',
                                                     'FOUND_HEADERS': 1},
                           'pargs': { 'flags': [], 'nargs': '1+'}},
-    'hpx_configure_module_producer': { 'kwargs': { 'MODULE_OUT_DIR': 1},
+    'hpx_configure_module_producer': { 'kwargs': {},
                           'pargs': { 'flags': [], 'nargs': '1+'}}
   }
 

.github/workflows/cancel-workflows.yml

@@ -54,7 +54,7 @@ jobs:
         queries: security-and-quality
 
     - name: Install CMake
-      uses: lukka/get-cmake@v4.3.0
+      uses: jwlawson/actions-setup-cmake@v2.2
 
     - name: Install Ninja
       uses: seanmiddleditch/gha-setup-ninja@master

.github/workflows/codeql.yml

@@ -35,15 +35,15 @@ jobs:
     - uses: actions/checkout@v6
 
     - name: Download Documentation Artifacts
-      uses: dawidd6/action-download-artifact@v21
+      uses: dawidd6/action-download-artifact@v20
       with:
         workflow: documentation-build.yml
         commit: ${{ github.event.workflow_run.head_sha || github.sha }}
         name: documentation-artifacts
         path: /__w/hpx/hpx/build/share/hpx/docs
 
     - name: Download Depreport Artifacts
-      uses: dawidd6/action-download-artifact@v21
+      uses: dawidd6/action-download-artifact@v20
       with:
         workflow: depreport.yml
         commit: ${{ github.event.workflow_run.head_sha || github.sha }}

.github/workflows/documentation-push.yml

@@ -50,7 +50,6 @@ jobs:
           cmake --build build --target core
           cmake --build build --target tests.unit.modules.algorithms.datapar_algorithms
           cmake --build build --target tests.regressions.modules.algorithms.for_each_datapar
-          cmake --build build --target tests.regressions.modules.algorithms.counting_iterator_datapar
     - name: Test
       shell: bash
       run: |

.github/workflows/linux_crosscompile_arm_eve_sve_release.yml

@@ -50,7 +50,6 @@ jobs:
           cmake --build build --target core
           cmake --build build --target tests.unit.modules.algorithms.datapar_algorithms
           cmake --build build --target tests.regressions.modules.algorithms.for_each_datapar
-          cmake --build build --target tests.regressions.modules.algorithms.counting_iterator_datapar
     - name: Test
       shell: bash
       run: |

.github/workflows/linux_crosscompile_arm_sve_release.yml

@@ -19,7 +19,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
-    - uses: lukka/get-cmake@v4.3.0
+    - uses: jwlawson/actions-setup-cmake@v2.2
+      with:
+        github-api-token: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Install dependencies
       run: |

.github/workflows/windows_clang_debug.yml

@@ -19,7 +19,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
-    - uses: lukka/get-cmake@v4.3.0
+    - uses: jwlawson/actions-setup-cmake@v2.2
+      with:
+        github-api-token: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Install dependencies
       run: |

.github/workflows/windows_clang_release.yml

@@ -19,7 +19,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
-    - uses: lukka/get-cmake@v4.3.0
+    - uses: jwlawson/actions-setup-cmake@v2.2
+      with:
+        github-api-token: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Install dependencies
       run: |

.github/workflows/windows_debug_vs2022.yml

@@ -18,7 +18,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: lukka/get-cmake@v4.3.0
+      - uses: jwlawson/actions-setup-cmake@v2.2
+        with:
+          github-api-token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Install dependencies
         run: |