Fix sendGAEvent function (#62065)
Previous implementation of `sendGAEvent` was pushing arguments to
`dataLayer` via rest parameter syntax, resulting in an actual array,
which GA doesn't seem to process correctly (resulting in the event not
showing up in GA reports). This PR refactors it to a vanilla JS function
passing data via the `arguments` array-like object, which is able to be
processed correctly and results in the event showing up as expected.
fixes [61703](https://github.com/vercel/next.js/issues/61703)
Co-authored-by: JJ Kasper <jj@jjsweb.site>
