[iOS][Spotlight] Use a temporary lens entry point annotation.

Use a temporary "Spotlight" annotation for Siri Shortcuts aka Intents.

(cherry picked from commit c58cae7)

Bug: 1487646
Change-Id: Ibaa97e38b18bc8fc98d8845e02e87cb8c8ccadb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4915653
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Jason Hu <hujasonx@google.com>
Auto-Submit: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1205871}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4916941
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Krishna Govind <govind@chromium.org>
Owners-Override: Krishna Govind <govind@chromium.org>
Commit-Queue: Krishna Govind <govind@chromium.org>
Cr-Commit-Position: refs/branch-heads/6045@{chromium#186}
Cr-Branched-From: 905e8bd-refs/heads/main@{#1204232}

ios/chrome/browser/shared/coordinator/scene/scene_controller.mm

@@ -2512,7 +2512,7 @@ - (ProceduralBlock)completionBlockForTriggeringAction:
       };
     case START_LENS_FROM_INTENTS:
       return ^{
-        [weakSelf startLensWithEntryPoint:LensEntrypoint::Intents];
+        [weakSelf startLensWithEntryPoint:LensEntrypoint::Spotlight];
       };
     case FOCUS_OMNIBOX:
       return ^{