VTK: Use glad for dynamic OpenGL context

• pending IceT bump icet!5 (merged), icet!5 (merged)
• VTK can now select a suitable OpenGL context backend among (GLX, EGL)/Win32, OSMesa in a single build at runtime using glad instead of glew.
• In a second commit, all glew header include statements and module dependencies on VTK::glew in ParaView were replaced with glad and VTK::glad respectively.
• Bumps VTK
  • Jaswant Panchumarti (Kitware): fix-color-buffer-sizes-warning-macos (vtk/vtk!11520 (merged))
  • Spiros Tsalikis: fix-field-data-dataset_adapter (vtk/vtk!11491 (merged))
  • Jaswant Panchumarti (Kitware): MissingIncludeOnAMRInternal (vtk/vtk!11516 (merged))
  • Sean McBride: UnitTestCells (vtk/vtk!11086 (merged))
  • David Gobbi: cppcheck2.14 (vtk/vtk!11088 (merged))
  • Vicente Bolea: remove-deps-jobs-java-builds (vtk/vtk!11499 (merged))
  • Spiros Tsalikis: fix-cth-performance-degradation (vtk/vtk!11511 (merged))
  • David Thompson: dg-work (vtk/vtk!11452 (merged))
  • Jaswant Panchumarti (Kitware): enable-multi-canvas-in-wasm-module (vtk/vtk!11512 (merged))
  • David Gobbi: tangents-32bit-smp (vtk/vtk!11508 (merged))
  • Jaswant Panchumarti (Kitware): fix-wasm-window-title (vtk/vtk!11509 (merged))
  • David Gobbi: python313-fixes-2 (vtk/vtk!11494 (merged))
  • Caitlin Ross: ensight-reader-flakiness-fix (vtk/vtk!11504 (merged))
  • Mathieu Westphal (Kitware): STLReaderMergingDocFix (vtk/vtk!11492 (merged))
  • Alexy Pellegrini: structured-data-windows-h (vtk/vtk!11489 (merged))
  • Sebastien Jourdain: marshaling-text-actor (vtk/vtk!11501 (merged))
  • David Gobbi: 19067-link-error (vtk/vtk!11365 (merged))
  • Jaswant Panchumarti (Kitware): fix-glad-static (vtk/vtk!11505 (merged))
  • David Gobbi: python-test-typo (vtk/vtk!11487 (merged))
  • Jaswant Panchumarti (Kitware): fix-opengl-flip-render-frame-buffer (vtk/vtk!11496 (merged))
  • Mathieu Westphal (Kitware): fix_webgpu_light (vtk/vtk!11493 (merged))
  • Ryan Krattiger: noop_add_shader_variable (vtk/vtk!11481 (merged))
  • Timothée Couble: move_vector_operators_methods (vtk/vtk!11423 (merged))
  • Sean McBride: SimpleCocoaVTKToken (vtk/vtk!11457 (merged))
  • Jaswant Panchumarti (Kitware): remove-glew-and-opengl-modules (vtk/vtk!11482 (merged))
  • David Gobbi: python313-fixes (vtk/vtk!11486 (merged))
  • Jaswant Panchumarti (Kitware): fix-opengl-cmake-for-mobile-devices (vtk/vtk!11488 (merged))
  • Mathieu Westphal (Kitware): warnings_gcc (vtk/vtk!11430 (merged))
  • Jaswant Panchumarti (Kitware): simplify-cell-to-primitive-calcs (vtk/vtk!11467 (merged))
  • Jaswant Panchumarti (Kitware): fix-line-representation-serialization (vtk/vtk!11484 (merged))
  • Jaswant Panchumarti (Kitware): engineless-wasm-test-runner (vtk/vtk!11464 (merged))
  • Cory Quammen: fix-cellarray-doc-string (vtk/vtk!11465 (merged))
  • Louis Gombert: htg-source-distributed-mask (vtk/vtk!11470 (merged))
  • Jaswant Panchumarti (Kitware): use-glad (vtk/vtk!11367 (merged))
  • Ryan Krattiger: configurable_esm_exponent (vtk/vtk!11374 (merged))
  • Mathieu Westphal (Kitware): polydatanormals (vtk/vtk!8265 (merged))
  • Jaswant Panchumarti (Kitware): make-wasm-tests-threadless (vtk/vtk!11476 (merged))
  • Lucas Givord: improve-compute-api (vtk/vtk!11463 (merged))
  • Mathieu Westphal (Kitware): fix_uri_texture_test (vtk/vtk!11477 (merged))
  • Mathieu Westphal (Kitware): reupload_baseline (vtk/vtk!11474 (merged))
  • Ben Boeckel: new-release-group-mentions (vtk/vtk!11472 (merged))
  • Spiros Tsalikis: xml_io_polyhedron (vtk/vtk!11363 (merged))
  • Charles Gueunet: polygon_quad_shortpath (vtk/vtk!11449 (merged))
  • Lucas Gandel: fix-DX-shared-multisamples (vtk/vtk!11454 (merged))
  • David Thompson: destructor-order (vtk/vtk!11475 (merged))
  • Mathieu Westphal (Kitware): obj_importer_fix (vtk/vtk!11473 (merged))
  • Mathieu Westphal (Kitware): improve_importer_collection (vtk/vtk!11303 (merged))
  • Dan Lipsa: 3dtiles_cleanup (vtk/vtk!11447 (merged))
  • Mathieu Westphal (Kitware): fix_gltf_uri_import (vtk/vtk!11468 (merged))
  • Jaswant Panchumarti (Kitware): webgpu-docs-warning-cleanup (vtk/vtk!11466 (merged))
  • Scott Wittenburg: vr-collaboration-fixes (vtk/vtk!11459 (merged))
  • Cory Quammen: rtd-conf-update (vtk/vtk!11469 (merged))
  • Ben Boeckel: static-crash (vtk/vtk!11392 (merged))
  • David Gobbi: cutter-leak (vtk/vtk!11315 (merged))
  • Andrew Bauer: xmlpwriter_fix (vtk/vtk!11456 (merged))
  • David Gobbi: sync-parse-tab (vtk/vtk!11455 (merged))
  • Jaswant Panchumarti (Kitware): ComputePipelineConfigurationConstructor (vtk/vtk!11436 (merged))
  • David Gobbi: more-array-bounds (vtk/vtk!11453 (merged))
  • Kenneth Moreland: adios2-vtx-misspell (vtk/vtk!11426 (merged))
  • Sankhesh Jhaveri: anari_zero_instancing (vtk/vtk!11445 (merged))
  • Jaswant Panchumarti (Kitware): add-corners-for-box-widget-rep (vtk/vtk!11450 (merged))
  • Jaswant Panchumarti (Kitware): set-testing-flag-in-cache (vtk/vtk!11431 (merged))