Revert "Skip TextureSubresourceTest.MipmapLevelsTest on Vulkan w/ validation"

This reverts commit e8dc820fbc1e28eba80b8e8c49bb3e566874f4e7.

Reason for revert: The Vulkan validation layers bug has been fixed

Original change's description:
> Skip TextureSubresourceTest.MipmapLevelsTest on Vulkan w/ validation
> 
> This test is broken after a validation layers update.
> 
> Tbr=cwallez@chromium.org
> Bug: dawn:517
> Change-Id: Ia685ba7bd17d8cdb49477997aaee4e5a9f00f9c7
> 
> Change-Id: I6f05516f00c8d05b96c8af578e09df9dc416385b
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/27123
> Reviewed-by: Austin Eng <enga@chromium.org>
> Commit-Queue: Austin Eng <enga@chromium.org>

TBR=cwallez@chromium.org,enga@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: dawn:517
Change-Id: I844960bfda35be59659ee88ff8b5028fbd0ca612
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/27400
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
diff --git a/src/tests/end2end/TextureSubresourceTests.cpp b/src/tests/end2end/TextureSubresourceTests.cpp
index 801f61c..e9276b2 100644
--- a/src/tests/end2end/TextureSubresourceTests.cpp
+++ b/src/tests/end2end/TextureSubresourceTests.cpp
@@ -137,10 +137,6 @@
 
 // Test different mipmap levels
 TEST_P(TextureSubresourceTest, MipmapLevelsTest) {
-    // TODO(crbug.com/dawn/517): The Vulkan backend hits this validation rule.
-    // https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#VUID-vkCmdDraw-None-02687
-    DAWN_SKIP_TEST_IF(IsBackendValidationEnabled() && IsVulkan());
-
     // Create a texture with 2 mipmap levels and 1 layer
     wgpu::Texture texture =
         CreateTexture(2, 1,