Reland "webnn: Enforce input data type constraints for gather indices"

This is a reland of commit ef29e11bfb1f1f4eae0935fb58f0e4129620837b

Original change's description:
> webnn: Enforce input data type constraints for gather indices
>
> As specified in webmachinelearning/webnn#646
>
> Bug: 328567884
> Change-Id: I33eba7e1def430b1cb94e3e7a4868e82c5bbd9a3
> Cq-Include-Trybots: luci.chromium.try:mac14-blink-rel,mac14.arm64-blink-rel
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5520313
> Reviewed-by: Austin Sullivan <[email protected]>
> Commit-Queue: Lisha Guo <[email protected]>
> Reviewed-by: ningxin hu <[email protected]>
> Cr-Commit-Position: refs/heads/main@{#1298443}

Bug: 328567884
Change-Id: Ide6a0e1bc6d3ebea7dce6bf37da4318e7b6e1bd1
Cq-Include-Trybots: luci.chromium.try:mac14-blink-rel,mac14.arm64-blink-rel

webnn/validation_tests/gather.https.any.js

@@ -14,7 +14,7 @@ const tests = [
   {
     name: '[gather] Test gather with axis = 2',
     input: {dataType: 'float32', dimensions: [1, 2, 3, 4]},
-    indices: {dataType: 'int64', dimensions: [5, 6]},
+    indices: {dataType: 'uint32', dimensions: [5, 6]},
     axis: 2,
     output: {dataType: 'float32', dimensions: [1, 2, 5, 6, 4]}
   },
@@ -32,9 +32,15 @@ const tests = [
   },
   {
     name:
-        '[gather] TypeError is expected if the data type of indices is invalid',
+        '[gather] TypeError is expected if the data type of indices is float32 which is invalid',
     input: {dataType: 'float16', dimensions: [1, 2, 3, 4]},
     indices: {dataType: 'float32', dimensions: [5, 6]}
+  },
+  {
+    name:
+        '[gather] TypeError is expected if the data type of indices is uint64 which is invalid',
+    input: {dataType: 'float16', dimensions: [1, 2, 3, 4]},
+    indices: {dataType: 'uint64', dimensions: [5, 6]}
   }
 ];