Create GL 4.6 test package

Create GL 4.6 test package

Ensures that tests for the extensions went into GL 4.6 can be
executed without checking for the extension string if run in
the 4.6 context.

Components: Framework, OpenGL

VK-GL-CTS issue: 640

Affects:
KHR-GL46.*
KHR-GL45.spirv_extensions.*
KHR-NoContext.es2.no_error.*
KHR-NoContext.gl30.no_error.*
KHR-GL45.polygon_offset_clamp.*
KHR-GL45.shader_group_vote_tests.*
KHR-GL43.indirect_parameters_tests.*
KHR-GL44.texture_filter_anisotropic.*
KHR-GLES3.texture_filter_anisotropic.*
KHR-GLES31.core.polygon_offset_clamp.*
KHR-GL45.shader_draw_parameters_tests.*
KHR-GL45.shader_atomic_counter_ops_tests.*
KHR-GL33.pipeline_statistics_query_tests_ARB.*
KHR-GL32.transform_feedback_overflow_query_ARB.*

Change-Id: Idbfacefb5c9e58611c4330b1a054b38bdd72ca87