[release/7.0] Fix DragDrop_CanTrigger() flakiness

[MackinnonBuck]

Fix DragDrop_CanTrigger() flakiness

Applies this change to the release/7.0 branch to fix a flaky test.

[ghost]

Hi @MackinnonBuck. If this is not a tell-mode PR, please make sure to follow the instructions laid out in the servicing process document.
Otherwise, please add tell-mode label.

[MackinnonBuck]

/backport to release/6.0

[github-actions]

Started backporting to release/6.0: https://github.com/dotnet/aspnetcore/actions/runs/6410072793

[github-actions]

@MackinnonBuck backporting to release/6.0 failed, the patch most likely resulted in conflicts:

$ git am --3way --ignore-whitespace --keep-non-patch changes.patch

Applying: Update EventTest.cs
Using index info to reconstruct a base tree...
M	src/Components/test/E2ETest/Tests/EventTest.cs
Falling back to patching base and 3-way merge...
Auto-merging src/Components/test/E2ETest/Tests/EventTest.cs
CONFLICT (content): Merge conflict in src/Components/test/E2ETest/Tests/EventTest.cs
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Update EventTest.cs
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[github-actions]

@MackinnonBuck an error occurred while backporting to release/6.0, please check the run log for details!

Error: git am failed, most likely due to a merge conflict.