Move RenderSVGEllipse -> LegacyRenderSVGEllipse, and introduce RenderSVGEllipse based on the downstream LBSE version, just like it was done for RenderSVGRect/LegacyRenderSVGRect (webkit.org/b/234878, webkit.org/b/234992).
Pull request: https://github.com/WebKit/WebKit/pull/912
Committed r294745 (250913@main): <https://commits.webkit.org/250913@main> Reviewed commits have been landed. Closing PR #912 and removing active labels.
<rdar://problem/93831273>