Mark wgpu::TextureComponentType as Dawn-specific.

It was renamed to wgpu::TextureSampleType in the spec but the enum is
still used in some parts of dawn::native. Tag the enum as internal for
now until we can change Format.h and friends to no longer require the
enum.

Bug: dawn:1682
Change-Id: I673353ff290495777ed1618810daa011b450dff5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/122122
Kokoro: Kokoro <noreply+kokoro@google.com>
Auto-Submit: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>

dawn.json

@@ -2705,6 +2705,7 @@
     },
     "texture component type": {
         "category": "enum",
+        "tags": ["dawn"],
         "values": [
             {"value": 0, "name": "float"},
             {"value": 1, "name": "sint"},