Move tests/data and assets to the main repository

This change moves the tests data files and publish folder of assets
repository to the main blender.git repository as LFS files.

The goal of this change is to eliminate toil of modifying tests,
cherry-picking changes to LFS branches, adding tests as part of a
PR which brings new features or fixes.

More detailed explanation and conversation can be found in the
design task.

Ref #137215

Pull Request: https://projects.blender.org/blender/blender/pulls/137219

.gitignore

@@ -22,6 +22,7 @@ CMakeLists.txt.user
 Thumbs.db
 ehthumbs.db
 Desktop.ini
+.DS_Store
 
 # commonly used paths in blender
 /blender.bin
@@ -67,6 +68,8 @@ waveletNoiseTile.bin
 /release/datafiles/locale/
 /release/scripts/addons_contrib/
 /source/tools/
+/release/datafiles/assets/
+/tests/data/
 
 # Build files for VS and VS Code.
 /build/
@@ -78,3 +81,8 @@ CMakeUserPresets.json
 # Compile commands generated by CMake that may be linked into the source code
 # folder to make it easier for tools like clangd to discover.
 compile_commands.json
+
+# Temporary Blender files.
+blendcache_*
+*.blend1
+*.blend2