[js/web] workaround NPM test fetch failure (#20020)
### Description
Sometimes the `npm test` failed with an error of "TypeError: Failed to
fetch".
I checked the callback entry of the localhost server started by karma.
When the "Failed to fetch" happens, no request is reflected on the
server side. The root cause is still not identified. However, as this
issue only happens sometimes when the browser is just launched by karma
runner, doing retry can workaround this issue for most of the time.
