[UR] Generated code hidden by default in PR diffs (#17414)

This patch extends the `.gitattributes` file to mark all generated
source files with the `linguist-generated=true` attribute. This results
in PR diffs to not display changes to these files by default to avoid
distracting reviewers. The diffs can still be expanded by users who wish
to review their content.

Author: kbenzie

unified-runtime/.gitattributes

@@ -1 +1,30 @@
 * text=auto
+
+# These are files generated from Mako templates and the yaml specification,
+# mark them so they are not displayed by default in diffs in GitHub PRs.
+include/ur_api.h linguist-generated=true
+include/ur_api_funcs.def linguist-generated=true
+include/ur_ddi.h linguist-generated=true
+include/ur_print.h linguist-generated=true
+include/ur_print.hpp linguist-generated=true
+source/adapters/adapter.def.in linguist-generated=true
+source/adapters/adapter.map.in linguist-generated=true
+source/adapters/level_zero/ur_interface_loader.cpp linguist-generated=true
+source/adapters/level_zero/ur_interface_loader.hpp linguist-generated=true
+source/adapters/level_zero/v2/queue_api.cpp linguist-generated=true
+source/adapters/level_zero/v2/queue_api.hpp linguist-generated=true
+source/adapters/mock/ur_mockddi.cpp linguist-generated=true
+source/common/stype_map_helpers.def linguist-generated=true
+source/loader/layers/tracing/ur_trcddi.cpp linguist-generated=true
+source/loader/layers/validation/ur_valddi.cpp linguist-generated=true
+source/loader/loader.def.in linguist-generated=true
+source/loader/loader.map.in linguist-generated=true
+source/loader/ur_ldrddi.cpp linguist-generated=true
+source/loader/ur_ldrddi.hpp linguist-generated=true
+source/loader/ur_libapi.cpp linguist-generated=true
+source/loader/ur_libddi.cpp linguist-generated=true
+source/loader/ur_manifests.hpp linguist-generated=true
+source/loader/ur_print.cpp linguist-generated=true
+source/ur_api.cpp linguist-generated=true
+test/conformance/testing/include/uur/optional_queries.h linguist-generated=true
+tools/urinfo/urinfo.hpp linguist-generated=true